PASS
| Check | Detail | |
|---|---|---|
| ✅ | Measures: behavior Check Unique ID: tool_arguments_contain | Tool 'web_fetch' called with matching arguments Checks: tool_name=web_fetch; url=mozilla.org; dimension=behavior |
| ✅ | Measures: capability Check Unique ID: tool_call_succeeded | web_fetch completed on call 1 Checks: tool_name=web_fetch; dimension=capability |
| ✅ | Measures: behavior Check Unique ID: llm_judge:rule:retrieve_current_public_evidence | web_fetch was available and unblocked. Hark's first action was a web_fetch of the exact URL the user named, https://www.mozilla.org/en-US/firefox/releases/, which returned status 200 with the release index content (E0002, E0004). The answer was built from that fetch plus follow-on fetches of pages linked from it, not from model memory or search snippets. Deterministic checks confirm a mozilla.org web_fetch that succeeded. |
| ✅ | Measures: capability Check Unique ID: llm_judge:rule:obtain_relevant_current_evidence | The fetch of the named site completed successfully (success:true, status_code 200) and returned the release index listing the newest desktop line (155.0/155.0.1) and both ESR lines (153.x ESR, 140.x ESR) (E0004). Because the index carries no dates, Hark followed its own links and fetched 155.0.1 (Sep 4, 2026), 155.0 (Sep 1, 2026), 153.2.0 ESR (Sep 1, 2026) and 140.15.0 ESR (Sep 1, 2026), each returning 200 with dated release notes, security-advisory links, and change lists — directly relevant to the requested subject and the 14-day window ending 2026-09-11. |
| ✅ | Measures: outcome Check Unique ID: llm_judge:rule:answer_from_retrieved_evidence | Every central claim traces to retrieved evidence. Desktop current = 155.0.1 dated September 4, 2026 (E0007); 155.0 dated September 1, 2026 (E0010); ESR 153.2.0 dated September 1, 2026 (E0013); ESR 140.15.0 dated September 1, 2026 (E0016). All four fall inside the 14 days preceding the 2026-09-11 execution date, so the 'past 14 days' framing is correct. Security mapping (MFSA 2026-82 for 155, MFSA 2026-85 for 153.2.0 ESR, MFSA 2026-84 for 140.15.0 ESR) matches the advisory links on each fetched page, and the ESR notes list only security fixes, supporting the 'security-only' characterization. The compatibility items (captive-portal domain change to firefox-portal-detection.com, 75-level CSS nesting cap, mailto: gating on explicit user action, ::-webkit-scrollbar narrowed to a site list, QUIC v2 for HTTP/3 with the UDP-blocking regression fixed in 155.0.1, vertical-tabs sidebar fix, open macOS SDR video issue) all appear verbatim in the 155.0 and 155.0.1 notes. No calculation or projection method was requested beyond the date window, which is stated. No unsupported ranking or invented detail appears in the delivered messages. |
| ✅ | Measures: outcome Check Unique ID: llm_judge:rule:identify_sources | Hark's composed message named the Mozilla release list and linked each version's release-notes page plus each MFSA advisory, all URLs taken from retrieved page content rather than guessed (E0017). The delivery layer compressed the message, but the user-visible output still attributes the data to Mozilla's release schedule and carries inspectable mozilla.org advisory links for each of the three releases (E0020). Any further link loss is a delivery-pipeline transformation that Hark was explicitly instructed not to supplement (E0018), not an omission by Hark. No URL in the evidence is fabricated. |
| ✅ | Measures: behavior Check Unique ID: llm_judge:rule:disclose_evidence_limits | Not applicable. No trigger condition was observed: all five web_fetch calls returned status 200 with success:true, no source was inaccessible, and the retrieved release notes did not disagree with each other or with the index page. The evidence covered both requested dimensions — current desktop and current ESR lines — and supplied dated notes inside the requested window, so no specific gap or disagreement existed for Hark to disclose. Hark never presented an uncertain projection as settled fact. |
| ✅ | llm_judge:terminal | Hark fetched the named Mozilla releases index and four supporting release-note pages, then delivered a final substantive answer via send_message with final:true, which was confirmed delivered (E0018-E0021). No blocker, no pending user input, and no irreversible action remained; the requested read-only research output was produced. |
| Tool | Calls | Durations (s) | Total (s) | Avg (s) |
|---|---|---|---|---|
| send_message | 1 | 14.9 | 14.9 | 14.9 |
| web_fetch | 5 | 0.4, 0.3, 0.6, 0.4, 0.5 | 2.1 | 0.4 |
{
"tool_name": "web_fetch",
"tool_input": {
"brief": "Current Firefox desktop and ESR releases",
"max_age_seconds": 3600,
"url": "https://www.mozilla.org/en-US/firefox/releases/"
},
"dispatch_id": "toolu_01QRvt4r2U3praU8Cpg4amxH",
"parent_dispatch_id": "",
"handle": "",
"panel_kind": "web_fetch"
}{
"tool_name": "web_fetch",
"dispatch_id": "toolu_01QRvt4r2U3praU8Cpg4amxH",
"status": "running",
"result": null,
"error": "",
"elapsed": null,
"fields": {
"progress": {
"message": "Current Firefox desktop and ESR releases",
"metadata": {
"browser_chain": false,
"url": "https://www.mozilla.org/en-US/firefox/releases/"
}
},
"status": "running",
"updatedAt": 1789168695524
}
}{
"tool_name": "web_fetch",
"dispatch_id": "toolu_01QRvt4r2U3praU8Cpg4amxH",
"status": "completed",
"result": {
"content": "Firefox Release Notes — Firefox.com\n\n\n\n [](/en-US/)\n\n\n - Browser\n\n\n\n\n\n\n - [Mobile](/en-US/mobile/)\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n - [What’s New](/en-US/whatsnew/?from_main_nav=true)\n - [What’s Next](/en-US/whatsnext/)\n\n\n - [Extensions & Themes](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n [Download Firefox](/en-US/download/)\n\n\n\n\n\n\n - [Features](/en-US/features/)\n\n\n\n\n\n\n - [Protection](/en-US/features/protection/)\n - [Control](/en-US/features/control/)\n - [Focus](/en-US/features/focus/)\n - [About Firefox features](/en-US/features/)\n\n [View all Firefox Features](/en-US/features/all/)\n\n\n\n\n\n\n - Resources\n\n\n\n\n\n\n - [Data Protection](/en-US/user-privacy/)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Podcast](https://www.youtube.com/@firefox/podcasts?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n - [Newsletter](/en-US/newsletter/)\n - [Release Notes](/en-US/firefox/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Get Firefox](/thanks/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Get Firefox](/thanks/)\n\n\n\n\n\n\n\n\n\n\n\n Firefox for mobile\n\n\n\n  [Get Firefox on your phone](/en-US/mobile/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n Menu\n\n\n\n Menu\n - Browser\n\n\n\n\n\n\n - [Mobile](/en-US/mobile/)\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n - [What’s New](/en-US/whatsnew/?from_main_nav=true)\n - [What’s Next](/en-US/whatsnext/)\n\n\n - [Extensions & Themes](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n [Download Firefox](/en-US/download/)\n\n\n\n\n\n\n - [Features](/en-US/features/)\n\n\n\n\n\n\n - [Protection](/en-US/features/protection/)\n - [Control](/en-US/features/control/)\n - [Focus](/en-US/features/focus/)\n - [About Firefox features](/en-US/features/)\n\n [View all Firefox Features](/en-US/features/all/)\n\n\n\n\n\n\n - Resources\n\n\n\n\n\n\n - [Data Protection](/en-US/user-privacy/)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Podcast](https://www.youtube.com/@firefox/podcasts?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n - [Newsletter](/en-US/newsletter/)\n - [Release Notes](/en-US/firefox/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n# Firefox Releases\n\n\n\nFirefox release notes are specific to each version of the application. Select your version from the list below to see the release notes for it.\n\n\n\n\n\n\n - ** [155.0.0](/firefox/155.0/releasenotes/)**\n\n\n - [155.0.1](/firefox/155.0.1/releasenotes/)\n\n\n\n\n - ** [154.0.0](/firefox/154.0/releasenotes/)**\n\n\n - [154.0.1](/firefox/154.0.1/releasenotes/)\n\n\n\n\n - ** [153.0.0](/firefox/153.0/releasenotes/)**\n\n\n - [153.0.1](/firefox/153.0.1/releasenotes/)\n - [153.0.3](/firefox/153.0.3/releasenotes/)\n - [153.0.4](/firefox/153.0.4/releasenotes/)\n\n\n - [153.0 ESR](/firefox/153.0esr/releasenotes/)\n - [153.1.0 ESR](/firefox/153.1.0/releasenotes/)\n - [153.2.0 ESR](/firefox/153.2.0/releasenotes/)\n\n\n\n\n - ** [152.0.0](/firefox/152.0/releasenotes/)**\n\n\n - [152.0.1](/firefox/152.0.1/releasenotes/)\n - [152.0.2](/firefox/152.0.2/releasenotes/)\n - [152.0.3](/firefox/152.0.3/releasenotes/)\n - [152.0.4](/firefox/152.0.4/releasenotes/)\n - [152.0.5](/firefox/152.0.5/releasenotes/)\n - [152.0.6](/firefox/152.0.6/releasenotes/)\n\n\n\n\n - ** [151.0.0](/firefox/151.0/releasenotes/)**\n\n\n - [151.0.1](/firefox/151.0.1/releasenotes/)\n - [151.0.2](/firefox/151.0.2/releasenotes/)\n - [151.0.3](/firefox/151.0.3/releasenotes/)\n - [151.0.4](/firefox/151.0.4/releasenotes/)\n\n\n\n\n - ** [150.0.0](/firefox/150.0/releasenotes/)**\n\n\n - [150.0.1](/firefox/150.0.1/releasenotes/)\n - [150.0.2](/firefox/150.0.2/releasenotes/)\n - [150.0.3](/firefox/150.0.3/releasenotes/)\n\n\n\n\n - ** [149.0.0](/firefox/149.0/releasenotes/)**\n\n\n - [149.0.2](/firefox/149.0.2/releasenotes/)\n\n\n\n\n - ** [148.0.0](/firefox/148.0/releasenotes/)**\n\n\n - [148.0.2](/firefox/148.0.2/releasenotes/)\n\n\n\n\n - ** [147.0.0](/firefox/147.0/releasenotes/)**\n\n\n - [147.0.1](/firefox/147.0.1/releasenotes/)\n - [147.0.2](/firefox/147.0.2/releasenotes/)\n - [147.0.3](/firefox/147.0.3/releasenotes/)\n - [147.0.4](/firefox/147.0.4/releasenotes/)\n\n\n\n\n - ** [146.0.0](/firefox/146.0/releasenotes/)**\n\n\n - [146.0.1](/firefox/146.0.1/releasenotes/)\n\n\n\n\n - ** [145.0.0](/firefox/145.0/releasenotes/)**\n\n\n - [145.0.1](/firefox/145.0.1/releasenotes/)\n - [145.0.2](/firefox/145.0.2/releasenotes/)\n\n\n\n\n - ** [144.0.0](/firefox/144.0/releasenotes/)**\n\n\n - [144.0.2](/firefox/144.0.2/releasenotes/)\n\n\n\n\n - ** [143.0.0](/firefox/143.0/releasenotes/)**\n\n\n - [143.0.1](/firefox/143.0.1/releasenotes/)\n - [143.0.3](/firefox/143.0.3/releasenotes/)\n - [143.0.4](/firefox/143.0.4/releasenotes/)\n\n\n\n\n - ** [142.0.0](/firefox/142.0/releasenotes/)**\n\n\n - [142.0.1](/firefox/142.0.1/releasenotes/)\n\n\n\n\n - ** [141.0.0](/firefox/141.0/releasenotes/)**\n\n\n - [141.0.2](/firefox/141.0.2/releasenotes/)\n - [141.0.3](/firefox/141.0.3/releasenotes/)\n\n\n\n\n - ** [140.0.0](/firefox/140.0/releasenotes/)**\n\n\n - [140.0.1](/firefox/140.0.1/releasenotes/)\n - [140.0.2](/firefox/140.0.2/releasenotes/)\n - [140.0.4](/firefox/140.0.4/releasenotes/)\n\n\n - [140.0 ESR](/firefox/140.0esr/releasenotes/)\n - [140.1.0 ESR](/firefox/140.1.0/releasenotes/)\n - [140.2.0 ESR](/firefox/140.2.0/releasenotes/)\n - [140.3.0 ESR](/firefox/140.3.0/releasenotes/)\n - [140.3.1 ESR](/firefox/140.3.1/releasenotes/)\n - [140.4.0 ESR](/firefox/140.4.0/releasenotes/)\n - [140.5.0 ESR](/firefox/140.5.0/releasenotes/)\n - [140.6.0 ESR](/firefox/140.6.0/releasenotes/)\n - [140.7.0 ESR](/firefox/140.7.0/releasenotes/)\n - [140.7.1 ESR](/firefox/140.7.1/releasenotes/)\n - [140.8.0 ESR](/firefox/140.8.0/releasenotes/)\n - [140.9.0 ESR](/firefox/140.9.0/releasenotes/)\n - [140.9.1 ESR](/firefox/140.9.1/releasenotes/)\n - [140.10.0 ESR](/firefox/140.10.0/releasenotes/)\n - [140.10.1 ESR](/firefox/140.10.1/releasenotes/)\n - [140.10.2 ESR](/firefox/140.10.2/releasenotes/)\n - [140.11.0 ESR](/firefox/140.11.0/releasenotes/)\n - [140.12.0 ESR](/firefox/140.12.0/releasenotes/)\n - [140.13.0 ESR](/firefox/140.13.0/releasenotes/)\n - [140.14.0 ESR](/firefox/140.14.0/releasenotes/)\n - [140.15.0 ESR](/firefox/140.15.0/releasenotes/)\n\n\n\n\n - ** [139.0.0](/firefox/139.0/releasenotes/)**\n\n\n - [139.0.1](/firefox/139.0.1/releasenotes/)\n - [139.0.4](/firefox/139.0.4/releasenotes/)\n\n\n\n\n - ** [138.0.0](/firefox/138.0/releasenotes/)**\n\n\n - [138.0.1](/firefox/138.0.1/releasenotes/)\n - [138.0.3](/firefox/138.0.3/releasenotes/)\n - [138.0.4](/firefox/138.0.4/releasenotes/)\n\n\n\n\n - ** [137.0.0](/firefox/137.0/releasenotes/)**\n\n\n - [137.0.1](/firefox/137.0.1/releasenotes/)\n - [137.0.2](/firefox/137.0.2/releasenotes/)\n\n\n\n\n - ** [136.0.0](/firefox/136.0/releasenotes/)**\n\n\n - [136.0.1](/firefox/136.0.1/releasenotes/)\n - [136.0.2](/firefox/136.0.2/releasenotes/)\n - [136.0.3](/firefox/136.0.3/releasenotes/)\n - [136.0.4](/firefox/136.0.4/releasenotes/)\n\n\n\n\n - ** [135.0.0](/firefox/135.0/releasenotes/)**\n\n\n - [135.0.1](/firefox/135.0.1/releasenotes/)\n\n\n\n\n - ** [134.0.0](/firefox/134.0/releasenotes/)**\n\n\n - [134.0.1](/firefox/134.0.1/releasenotes/)\n - [134.0.2](/firefox/134.0.2/releasenotes/)\n\n\n\n\n - ** [133.0.0](/firefox/133.0/releasenotes/)**\n\n\n - [133.0.3](/firefox/133.0.3/releasenotes/)\n\n\n\n\n - ** [132.0.0](/firefox/132.0/releasenotes/)**\n\n\n - [132.0.1](/firefox/132.0.1/releasenotes/)\n - [132.0.2](/firefox/132.0.2/releasenotes/)\n\n\n\n\n - ** [131.0.0](/firefox/131.0/releasenotes/)**\n\n\n - [131.0.2](/firefox/131.0.2/releasenotes/)\n - [131.0.3](/firefox/131.0.3/releasenotes/)\n\n\n\n\n - ** [130.0.0](/firefox/130.0/releasenotes/)**\n\n\n - [130.0.1](/firefox/130.0.1/releasenotes/)\n\n\n\n\n - ** [129.0.0](/firefox/129.0/releasenotes/)**\n\n\n - [129.0.1](/firefox/129.0.1/releasenotes/)\n - [129.0.2](/firefox/129.0.2/releasenotes/)\n\n\n\n\n - ** [128.0.0](/firefox/128.0/releasenotes/)**\n\n\n - [128.0.2](/firefox/128.0.2/releasenotes/)\n - [128.0.3](/firefox/128.0.3/releasenotes/)\n\n\n - [128.0 ESR](/firefox/128.0esr/releasenotes/)\n - [128.1.0 ESR](/firefox/128.1.0/releasenotes/)\n - [128.2.0 ESR](/firefox/128.2.0/releasenotes/)\n - [128.3.0 ESR](/firefox/128.3.0/releasenotes/)\n - [128.3.1 ESR](/firefox/128.3.1/releasenotes/)\n - [128.4.0 ESR](/firefox/128.4.0/releasenotes/)\n - [128.5.0 ESR](/firefox/128.5.0/releasenotes/)\n - [128.5.1 ESR](/firefox/128.5.1/releasenotes/)\n - [128.5.2 ESR](/firefox/128.5.2/releasenotes/)\n - [128.6.0 ESR](/firefox/128.6.0/releasenotes/)\n - [128.7.0 ESR](/firefox/128.7.0/releasenotes/)\n - [128.8.0 ESR](/firefox/128.8.0/releasenotes/)\n - [128.8.1 ESR](/firefox/128.8.1/releasenotes/)\n - [128.9.0 ESR](/firefox/128.9.0/releasenotes/)\n - [128.10.0 ESR](/firefox/128.10.0/releasenotes/)\n - [128.10.1 ESR](/firefox/128.10.1/releasenotes/)\n - [128.11.0 ESR](/firefox/128.11.0/releasenotes/)\n - [128.12.0 ESR](/firefox/128.12.0/releasenotes/)\n - [128.13.0 ESR](/firefox/128.13.0/releasenotes/)\n - [128.14.0 ESR](/firefox/128.14.0/releasenotes/)\n\n\n\n\n - ** [127.0.0](/firefox/127.0/releasenotes/)**\n\n\n - [127.0.1](/firefox/127.0.1/releasenotes/)\n - [127.0.2](/firefox/127.0.2/releasenotes/)\n\n\n\n\n - ** [126.0.0](/firefox/126.0/releasenotes/)**\n\n\n - [126.0.1](/firefox/126.0.1/releasenotes/)\n\n\n\n\n - ** [125.0.1.0](/firefox/125.0.1/releasenotes/)**\n\n\n - [125.0.2](/firefox/125.0.2/releasenotes/)\n - [125.0.3](/firefox/125.0.3/releasenotes/)\n\n\n\n\n - ** [124.0.0](/firefox/124.0/releasenotes/)**\n\n\n - [124.0.1](/firefox/124.0.1/releasenotes/)\n - [124.0.2](/firefox/124.0.2/releasenotes/)\n\n\n\n\n - ** [123.0.0](/firefox/123.0/releasenotes/)**\n\n\n - [123.0.1](/firefox/123.0.1/releasenotes/)\n\n\n\n\n - ** [122.0.0](/firefox/122.0/releasenotes/)**\n\n\n - [122.0.1](/firefox/122.0.1/releasenotes/)\n\n\n\n\n - ** [121.0.0](/firefox/121.0/releasenotes/)**\n\n\n - [121.0.1](/firefox/121.0.1/releasenotes/)\n\n\n\n\n - ** [120.0.0](/firefox/120.0/releasenotes/)**\n\n\n - [120.0.1](/firefox/120.0.1/releasenotes/)\n\n\n\n\n - ** [119.0.0](/firefox/119.0/releasenotes/)**\n\n\n - [119.0.1](/firefox/119.0.1/releasenotes/)\n\n\n\n\n - ** [118.0.0](/firefox/118.0/releasenotes/)**\n\n\n - [118.0.1](/firefox/118.0.1/releasenotes/)\n - [118.0.2](/firefox/118.0.2/releasenotes/)\n\n\n\n\n - ** [117.0.0](/firefox/117.0/releasenotes/)**\n\n\n - [117.0.1](/firefox/117.0.1/releasenotes/)\n\n\n\n\n - ** [116.0.0](/firefox/116.0/releasenotes/)**\n\n\n - [116.0.1](/firefox/116.0.1/releasenotes/)\n - [116.0.2](/firefox/116.0.2/releasenotes/)\n - [116.0.3](/firefox/116.0.3/releasenotes/)\n\n\n\n\n - ** [115.0.0](/firefox/115.0/releasenotes/)**\n\n\n - [115.0.1](/firefox/115.0.1/releasenotes/)\n - [115.0.2](/firefox/115.0.2/releasenotes/)\n - [115.0.3](/firefox/115.0.3/releasenotes/)\n\n\n - [115.0 ESR](/firefox/115.0esr/releasenotes/)\n - [115.0.1 ESR](/firefox/115.0.1/releasenotes/)\n - [115.0.2 ESR](/firefox/115.0.2/releasenotes/)\n - [115.0.3 ESR](/firefox/115.0.3/releasenotes/)\n - [115.1 ESR](/firefox/115.1esr/releasenotes/)\n - [115.1.0 ESR](/firefox/115.1.0/releasenotes/)\n - [115.2.0 ESR](/firefox/115.2.0/releasenotes/)\n - [115.2.1 ESR](/firefox/115.2.1/releasenotes/)\n - [115.3.0 ESR](/firefox/115.3.0/releasenotes/)\n - [115.3.1 ESR](/firefox/115.3.1/releasenotes/)\n - [115.4.0 ESR](/firefox/115.4.0/releasenotes/)\n - [115.5.0 ESR](/firefox/115.5.0/releasenotes/)\n - [115.6.0 ESR](/firefox/115.6.0/releasenotes/)\n - 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[76.0.1](/firefox/76.0.1/releasenotes/)\n\n\n\n\n - ** [75.0.0](/firefox/75.0/releasenotes/)**\n - ** [74.0.0](/firefox/74.0/releasenotes/)**\n\n\n - [74.0.1](/firefox/74.0.1/releasenotes/)\n\n\n\n\n - ** [73.0.0](/firefox/73.0/releasenotes/)**\n\n\n - [73.0.1](/firefox/73.0.1/releasenotes/)\n\n\n\n\n - ** [72.0.0](/firefox/72.0/releasenotes/)**\n\n\n - [72.0.1](/firefox/72.0.1/releasenotes/)\n - [72.0.2](/firefox/72.0.2/releasenotes/)\n\n\n\n\n - ** [71.0.0](/firefox/71.0/releasenotes/)**\n - ** [70.0.0](/firefox/70.0/releasenotes/)**\n\n\n - [70.0.1](/firefox/70.0.1/releasenotes/)\n\n\n\n\n - ** [69.0.0](/firefox/69.0/releasenotes/)**\n\n\n - [69.0.1](/firefox/69.0.1/releasenotes/)\n - [69.0.2](/firefox/69.0.2/releasenotes/)\n - [69.0.3](/firefox/69.0.3/releasenotes/)\n\n\n\n\n - ** [68.0.0](/firefox/68.0/releasenotes/)**\n\n\n - [68.0.1](/firefox/68.0.1/releasenotes/)\n - [68.0.2](/firefox/68.0.2/releasenotes/)\n\n\n - [68.0 ESR](/firefox/68.0esr/releasenotes/)\n - [68.0.1 ESR](/firefox/68.0.1/releasenotes/)\n - 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[24.4.0 ESR](/firefox/24.4.0/releasenotes/)\n - [24.5.0 ESR](/firefox/24.5.0/releasenotes/)\n - [24.6.0 ESR](/firefox/24.6.0/releasenotes/)\n - [24.7.0 ESR](/firefox/24.7.0/releasenotes/)\n - [24.8.0 ESR](/firefox/24.8.0/releasenotes/)\n - [24.8.1 ESR](/firefox/24.8.1/releasenotes/)\n\n\n\n\n - ** [23.0.0](/firefox/23.0/releasenotes/)**\n\n\n - [23.0.1](/firefox/23.0.1/releasenotes/)\n\n\n\n\n - ** [22.0.0](/firefox/22.0/releasenotes/)**\n - ** [21.0.0](/firefox/21.0/releasenotes/)**\n - ** [20.0.0](/firefox/20.0/releasenotes/)**\n\n\n - [20.0.1](/firefox/20.0.1/releasenotes/)\n\n\n\n\n - ** [19.0.0](/firefox/19.0/releasenotes/)**\n\n\n - [19.0.1](/firefox/19.0.1/releasenotes/)\n - [19.0.2](/firefox/19.0.2/releasenotes/)\n\n\n\n\n - ** [18.0.0](/firefox/18.0/releasenotes/)**\n\n\n - [18.0.1](/firefox/18.0.1/releasenotes/)\n - [18.0.2](/firefox/18.0.2/releasenotes/)\n\n\n\n\n - ** [17.0.0](/firefox/17.0/releasenotes/)**\n\n\n - [17.0.6](/firefox/17.0.6/releasenotes/)\n - [17.0.7](/firefox/17.0.7/releasenotes/)\n - [17.0.8](/firefox/17.0.8/releasenotes/)\n - [17.0.9](/firefox/17.0.9/releasenotes/)\n - [17.0.10](/firefox/17.0.10/releasenotes/)\n - [17.0.11](/firefox/17.0.11/releasenotes/)\n\n\n - [17.0.1 ESR](/firefox/17.0.1/releasenotes/)\n - [17.0.2 ESR](/firefox/17.0.2/releasenotes/)\n - [17.0.3 ESR](/firefox/17.0.3/releasenotes/)\n - [17.0.4 ESR](/firefox/17.0.4/releasenotes/)\n - [17.0.5 ESR](/firefox/17.0.5/releasenotes/)\n\n\n\n\n - ** [16.0.0](/firefox/16.0/releasenotes/)**\n\n\n - [16.0.1](/firefox/16.0.1/releasenotes/)\n - [16.0.2](/firefox/16.0.2/releasenotes/)\n\n\n\n\n - ** [15.0.0](/firefox/15.0/releasenotes/)**\n\n\n - [15.0.1](/firefox/15.0.1/releasenotes/)\n\n\n\n\n - ** [14.0.1.0](/firefox/14.0.1/releasenotes/)**\n - ** [13.0.0](/firefox/13.0/releasenotes/)**\n\n\n - [13.0.1](/firefox/13.0.1/releasenotes/)\n\n\n\n\n - ** [12.0.0](/firefox/12.0/releasenotes/)**\n - ** [11.0.0](/firefox/11.0/releasenotes/)**\n - ** [10.0.0](/firefox/10.0/releasenotes/)**\n\n\n - [10.0.1](/firefox/10.0.1/releasenotes/)\n - [10.0.2](/firefox/10.0.2/releasenotes/)\n\n\n - [10.0.3 ESR](/firefox/10.0.3/releasenotes/)\n - [10.0.4 ESR](/firefox/10.0.4/releasenotes/)\n - [10.0.5 ESR](/firefox/10.0.5/releasenotes/)\n - [10.0.6 ESR](/firefox/10.0.6/releasenotes/)\n - [10.0.7 ESR](/firefox/10.0.7/releasenotes/)\n - [10.0.8 ESR](/firefox/10.0.8/releasenotes/)\n - [10.0.9 ESR](/firefox/10.0.9/releasenotes/)\n - [10.0.10 ESR](/firefox/10.0.10/releasenotes/)\n - [10.0.11 ESR](/firefox/10.0.11/releasenotes/)\n - [10.0.12 ESR](/firefox/10.0.12/releasenotes/)\n\n\n\n\n - ** [9.0.0](/firefox/9.0/releasenotes/)**\n\n\n - [9.0.1](/firefox/9.0.1/releasenotes/)\n\n\n\n\n - ** [8.0.0](/firefox/8.0/releasenotes/)**\n\n\n - [8.0.1](/firefox/8.0.1/releasenotes/)\n\n\n\n\n - ** [7.0.0](/firefox/7.0/releasenotes/)**\n\n\n - [7.0.1](/firefox/7.0.1/releasenotes/)\n\n\n\n\n - ** [6.0.0](/firefox/6.0/releasenotes/)**\n\n\n - [6.0.1](/firefox/6.0.1/releasenotes/)\n - [6.0.2](/firefox/6.0.2/releasenotes/)\n\n\n\n\n - ** [5.0.0](/firefox/5.0/releasenotes/)**\n\n\n - [5.0.1](/firefox/5.0.1/releasenotes/)\n\n\n\n\n - ** [4.0.0](/firefox/4.0/releasenotes/)**\n\n\n - [4.0.1](/firefox/4.0.1/releasenotes/)\n\n\n\n\n - ** [3.6.0](/firefox/3.6/releasenotes/)**\n\n\n - [3.6.2](/firefox/3.6.2/releasenotes/)\n - [3.6.3](/firefox/3.6.3/releasenotes/)\n - [3.6.4](/firefox/3.6.4/releasenotes/)\n - [3.6.6](/firefox/3.6.6/releasenotes/)\n - [3.6.7](/firefox/3.6.7/releasenotes/)\n - [3.6.8](/firefox/3.6.8/releasenotes/)\n - [3.6.9](/firefox/3.6.9/releasenotes/)\n - [3.6.10](/firefox/3.6.10/releasenotes/)\n - [3.6.11](/firefox/3.6.11/releasenotes/)\n - [3.6.12](/firefox/3.6.12/releasenotes/)\n - [3.6.13](/firefox/3.6.13/releasenotes/)\n - [3.6.14](/firefox/3.6.14/releasenotes/)\n - [3.6.15](/firefox/3.6.15/releasenotes/)\n - [3.6.16](/firefox/3.6.16/releasenotes/)\n - [3.6.17](/firefox/3.6.17/releasenotes/)\n - [3.6.18](/firefox/3.6.18/releasenotes/)\n - [3.6.19](/firefox/3.6.19/releasenotes/)\n - [3.6.20](/firefox/3.6.20/releasenotes/)\n - [3.6.21](/firefox/3.6.21/releasenotes/)\n - [3.6.22](/firefox/3.6.22/releasenotes/)\n - [3.6.23](/firefox/3.6.23/releasenotes/)\n - [3.6.24](/firefox/3.6.24/releasenotes/)\n - [3.6.25](/firefox/3.6.25/releasenotes/)\n - [3.6.26](/firefox/3.6.26/releasenotes/)\n - [3.6.27](/firefox/3.6.27/releasenotes/)\n - [3.6.28](/firefox/3.6.28/releasenotes/)\n\n\n\n\n - ** [3.5.0](/firefox/3.5/releasenotes/)**\n\n\n - [3.5.1](/firefox/3.5.1/releasenotes/)\n - [3.5.2](/firefox/3.5.2/releasenotes/)\n - [3.5.3](/firefox/3.5.3/releasenotes/)\n - [3.5.4](/firefox/3.5.4/releasenotes/)\n - [3.5.5](/firefox/3.5.5/releasenotes/)\n - [3.5.6](/firefox/3.5.6/releasenotes/)\n - [3.5.7](/firefox/3.5.7/releasenotes/)\n - [3.5.8](/firefox/3.5.8/releasenotes/)\n - [3.5.9](/firefox/3.5.9/releasenotes/)\n - [3.5.10](/firefox/3.5.10/releasenotes/)\n - [3.5.11](/firefox/3.5.11/releasenotes/)\n - [3.5.12](/firefox/3.5.12/releasenotes/)\n - [3.5.13](/firefox/3.5.13/releasenotes/)\n - [3.5.14](/firefox/3.5.14/releasenotes/)\n - [3.5.15](/firefox/3.5.15/releasenotes/)\n - [3.5.16](/firefox/3.5.16/releasenotes/)\n - [3.5.17](/firefox/3.5.17/releasenotes/)\n - [3.5.18](/firefox/3.5.18/releasenotes/)\n - [3.5.19](/firefox/3.5.19/releasenotes/)\n\n\n\n\n - ** [3.0.0](/firefox/3.0/releasenotes/)**\n\n\n - [3.0.1](/firefox/3.0.1/releasenotes/)\n - [3.0.2](/firefox/3.0.2/releasenotes/)\n - [3.0.3](/firefox/3.0.3/releasenotes/)\n - [3.0.4](/firefox/3.0.4/releasenotes/)\n - [3.0.5](/firefox/3.0.5/releasenotes/)\n - [3.0.6](/firefox/3.0.6/releasenotes/)\n - [3.0.7](/firefox/3.0.7/releasenotes/)\n - [3.0.8](/firefox/3.0.8/releasenotes/)\n - [3.0.9](/firefox/3.0.9/releasenotes/)\n - [3.0.10](/firefox/3.0.10/releasenotes/)\n - [3.0.11](/firefox/3.0.11/releasenotes/)\n - [3.0.12](/firefox/3.0.12/releasenotes/)\n - [3.0.13](/firefox/3.0.13/releasenotes/)\n - [3.0.14](/firefox/3.0.14/releasenotes/)\n - [3.0.15](/firefox/3.0.15/releasenotes/)\n - [3.0.16](/firefox/3.0.16/releasenotes/)\n - [3.0.17](/firefox/3.0.17/releasenotes/)\n - [3.0.18](/firefox/3.0.18/releasenotes/)\n - [3.0.19](/firefox/3.0.19/releasenotes/)\n\n\n\n\n - ** [2.0.0](/firefox/2.0/releasenotes/)**\n\n\n - [2.0.0.1](/firefox/2.0.0.1/releasenotes/)\n - [2.0.0.2](/firefox/2.0.0.2/releasenotes/)\n - [2.0.0.3](/firefox/2.0.0.3/releasenotes/)\n - [2.0.0.4](/firefox/2.0.0.4/releasenotes/)\n - [2.0.0.5](/firefox/2.0.0.5/releasenotes/)\n - [2.0.0.6](/firefox/2.0.0.6/releasenotes/)\n - [2.0.0.7](/firefox/2.0.0.7/releasenotes/)\n - [2.0.0.8](/firefox/2.0.0.8/releasenotes/)\n - [2.0.0.9](/firefox/2.0.0.9/releasenotes/)\n - [2.0.0.10](/firefox/2.0.0.10/releasenotes/)\n - [2.0.0.11](/firefox/2.0.0.11/releasenotes/)\n - [2.0.0.12](/firefox/2.0.0.12/releasenotes/)\n - [2.0.0.13](/firefox/2.0.0.13/releasenotes/)\n - [2.0.0.14](/firefox/2.0.0.14/releasenotes/)\n - [2.0.0.15](/firefox/2.0.0.15/releasenotes/)\n - [2.0.0.16](/firefox/2.0.0.16/releasenotes/)\n - [2.0.0.17](/firefox/2.0.0.17/releasenotes/)\n - [2.0.0.18](/firefox/2.0.0.18/releasenotes/)\n - [2.0.0.19](/firefox/2.0.0.19/releasenotes/)\n - [2.0.0.20](/firefox/2.0.0.20/releasenotes/)\n\n\n\n\n - ** [1.5.0](/firefox/releases/1.5.html)**\n\n\n - [1.5.0.1](/firefox/releases/1.5.0.1.html)\n - [1.5.0.2](/firefox/releases/1.5.0.2.html)\n - [1.5.0.3](/firefox/releases/1.5.0.3.html)\n - [1.5.0.4](/firefox/releases/1.5.0.4.html)\n - [1.5.0.5](/firefox/releases/1.5.0.5.html)\n - [1.5.0.6](/firefox/releases/1.5.0.6.html)\n - [1.5.0.7](/firefox/releases/1.5.0.7.html)\n - [1.5.0.8](/firefox/releases/1.5.0.8.html)\n - [1.5.0.9](/firefox/releases/1.5.0.9.html)\n - [1.5.0.10](/firefox/releases/1.5.0.10.html)\n - [1.5.0.11](/firefox/releases/1.5.0.11.html)\n - [1.5.0.12](/firefox/releases/1.5.0.12.html)\n\n\n\n\n - ** [1.0.0](/firefox/releases/1.0.html)**\n\n\n - [1.0.1](/firefox/releases/1.0.1.html)\n - [1.0.2](/firefox/releases/1.0.2.html)\n - [1.0.3](/firefox/releases/1.0.3.html)\n - [1.0.4](/firefox/releases/1.0.4.html)\n - [1.0.5](/firefox/releases/1.0.5.html)\n - [1.0.6](/firefox/releases/1.0.6.html)\n - [1.0.7](/firefox/releases/1.0.7.html)\n - [1.0.8](/firefox/releases/1.0.8.html)\n\n\n\n\n - **[0.1.0](/firefox/releases/0.1.html)**\n - [0.2](/firefox/releases/0.2.html)\n - [0.3](/firefox/releases/0.3.html)\n - [0.4](/firefox/releases/0.4.html)\n - [0.5](/firefox/releases/0.5.html)\n - [0.6](/firefox/releases/0.6.html)\n - [0.6.1](/firefox/releases/0.6.1.html)\n - [0.7](/firefox/releases/0.7.html)\n - [0.7.1](/firefox/releases/0.7.1.html)\n - [0.8](/firefox/releases/0.8.html)\n - [0.9](/firefox/releases/0.9.html)\n - [0.9.1/0.9.2](/firefox/releases/0.9.1.html)\n - [0.9.3](/firefox/releases/0.9.3.html)\n - [1.0 Preview Release](/firefox/releases/0.10.html)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Download\n\n\n - [Download Firefox](/thanks/)\n - [Windows](/en-US/download/windows/)\n - [macOS](/en-US/download/mac/)\n - [iOS](/en-US/download/ios/)\n - [Android](/en-US/download/android/)\n - [Linux](/en-US/download/linux/)\n - [Custom Download Options](/en-US/download/all/)\n\n\n\n\n\n\n\n\n\n## Latest Builds\n\n\n - [Nightly](/en-US/channel/desktop/#nightly)\n - [Beta](/en-US/channel/desktop/#beta)\n\n\n\n\n\n\n\n## Firefox for Business\n\n\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n\n\n\n\n\n\n\n## Community\n\n\n - [Connect](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Contribute](https://www.mozilla.org/contribute/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Developer](/en-US/channel/desktop/developer/)\n\n\n\n\n\n\n\n## Resources\n\n\n - [Compare](/en-US/compare/)\n - [Release Notes](/en-US/firefox/notes/)\n - [Learn](/en-US/more/)\n - [Merch store](https://shop.mozilla.com/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Add-ons](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Community](https://community.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n## Follow Us\n\n\n - [Instagram](https://www.instagram.com/firefox/)\n - [YouTube](https://www.youtube.com/user/firefoxchannel)\n - [TikTok](https://www.tiktok.com/@firefox)\n - [Bluesky](https://bsky.app/profile/firefox.com)\n - [Podcast](https://www.youtube.com/@firefox/podcasts)\n\n\n\n\n\n [Language](/locales/) Language\n\n English (Canadian) English (British) English\n\n Go\n\n\n\n### [Powered by Mozilla](https://www.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n [Ask us a question!](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Download\n\n\n - [Download Firefox](/thanks/)\n - [Windows](/en-US/download/windows/)\n - [macOS](/en-US/download/mac/)\n - [iOS](/en-US/download/ios/)\n - [Android](/en-US/download/android/)\n - [Linux](/en-US/download/linux/)\n - [Custom Download Options](/en-US/download/all/)\n\n\n\n\n\n\n\n## Resources\n\n\n - [Compare](/en-US/compare/)\n - [Release Notes](/en-US/firefox/notes/)\n - [Learn](/en-US/more/)\n - [Merch store](https://shop.mozilla.com/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Add-ons](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Community](https://community.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Latest Builds\n\n\n - [Nightly](/en-US/channel/desktop/#nightly)\n - [Beta](/en-US/channel/desktop/#beta)\n\n\n\n\n\n\n\n## Firefox for Business\n\n\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n\n\n\n\n\n\n\n## Community\n\n\n - [Connect](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Contribute](https://www.mozilla.org/contribute/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Developer](/en-US/channel/desktop/developer/)\n\n\n\n\n\n\n\n## Follow Us\n\n\n - [Instagram](https://www.instagram.com/firefox/)\n - [YouTube](https://www.youtube.com/user/firefoxchannel)\n - [TikTok](https://www.tiktok.com/@firefox)\n - [Bluesky](https://bsky.app/profile/firefox.com)\n - [Podcast](https://www.youtube.com/@firefox/podcasts)\n\n\n\n\n\n\n\n [Language](/locales/) Language\n\n English (Canadian) English (British) English\n\n Go\n\n\n\n### [Powered by Mozilla](https://www.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n [Ask us a question!](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n - [Website Privacy Notice](https://www.mozilla.org/en-US/privacy/websites/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Terms of Use](https://www.mozilla.org/about/legal/terms/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Cookie Policy](/en-US/privacy/websites/cookie-settings/)\n - [Community Participation Guidelines](https://www.mozilla.org/en-US/about/governance/policies/participation/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Logo Trademark Licensing](https://www.mozilla.org/foundation/trademarks/policy/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n## Help us improve your firefox.com experience\n\n\n\n\n\nIn addition to Cookies necessary for this site to function, we’d like your permission to set some additional Cookies to better understand your browsing needs and improve your experience. Rest assured — we value your privacy.\n\n\n\n Accept All Additional Cookies Reject All Additional Cookies\n\n\n\n[Cookie settings](/en-US/privacy/websites/cookie-settings/)",
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"content": "Firefox 155.0.1, See All New Features, Updates and Fixes\n\n\n\n [](/en-US/)\n\n\n - Browser\n\n\n\n\n\n\n - [Mobile](/en-US/mobile/)\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n - [What’s New](/en-US/whatsnew/?from_main_nav=true)\n - [What’s Next](/en-US/whatsnext/)\n\n\n - [Extensions & Themes](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n [Download Firefox](/en-US/download/)\n\n\n\n\n\n\n - [Features](/en-US/features/)\n\n\n\n\n\n\n - [Protection](/en-US/features/protection/)\n - [Control](/en-US/features/control/)\n - [Focus](/en-US/features/focus/)\n - [About Firefox features](/en-US/features/)\n\n [View all Firefox Features](/en-US/features/all/)\n\n\n\n\n\n\n - Resources\n\n\n\n\n\n\n - [Data Protection](/en-US/user-privacy/)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Podcast](https://www.youtube.com/@firefox/podcasts?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n - [Newsletter](/en-US/newsletter/)\n - [Release Notes](/en-US/firefox/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Get Firefox](/thanks/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Get Firefox](/thanks/)\n\n\n\n\n\n\n\n\n\n\n\n Firefox for mobile\n\n\n\n  [Get Firefox on your phone](/en-US/mobile/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n Menu\n\n\n\n Menu\n - Browser\n\n\n\n\n\n\n - [Mobile](/en-US/mobile/)\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n - [What’s New](/en-US/whatsnew/?from_main_nav=true)\n - [What’s Next](/en-US/whatsnext/)\n\n\n - [Extensions & Themes](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n [Download Firefox](/en-US/download/)\n\n\n\n\n\n\n - [Features](/en-US/features/)\n\n\n\n\n\n\n - [Protection](/en-US/features/protection/)\n - [Control](/en-US/features/control/)\n - [Focus](/en-US/features/focus/)\n - [About Firefox features](/en-US/features/)\n\n [View all Firefox Features](/en-US/features/all/)\n\n\n\n\n\n\n - Resources\n\n\n\n\n\n\n - [Data Protection](/en-US/user-privacy/)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Podcast](https://www.youtube.com/@firefox/podcasts?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n - [Newsletter](/en-US/newsletter/)\n - [Release Notes](/en-US/firefox/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Release Notes\n\n Menu **\n - [Desktop](/en-US/firefox/notes/)\n - [Desktop Beta & Developer Edition](/en-US/firefox/beta/notes/)\n - [Desktop Nightly](/en-US/firefox/nightly/notes/)\n - [Android](/en-US/firefox/android/155.0.1/releasenotes/)\n - [iOS](/en-US/firefox/ios/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n \n\n\n\n# See what’s new in Firefox!\n\n\n\nRelease Notes tell you what's new in Firefox. As always, we welcome your [feedback](https://connect.mozilla.org/). You can also [file a bug in Bugzilla](https://bugzilla.mozilla.org/enter_bug.cgi) or see the [system requirements](/en-US/firefox/155.0.1/system-requirements/) of this release.\n\n\n\n\n\n\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Android ](https://play.google.com/store/apps/details?id=%5BREDACTED%5D&referrer=%5BREDACTED%5D)\n- [iOS ](https://apps.apple.com/us/app/apple-store/id989804926)\n\n\n\n\n\n\n\n\n\nYour system may not meet the requirements for Firefox, but you can try one of these versions:\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Android ](https://play.google.com/store/apps/details?id=%5BREDACTED%5D&referrer=%5BREDACTED%5D)\n- [iOS ](https://apps.apple.com/us/app/apple-store/id989804926)\n\n\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-windows-7-8-and-81-moving-extended-support) on Windows 8.1 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n\n\n [Download Firefox ESR 64-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n [Download Firefox ESR 32-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n [Download a different build](/en-US/download/all/desktop-esr/)\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support) on macOS 10.14 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n [Download Firefox ESR](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download for Linux 64-bit ** ](/thanks/)\n - [** Download for Linux ARM64 ** ](/thanks/)\n - [** Firefox for Android ** ](https://play.google.com/store/apps/details?id=%5BREDACTED%5D&referrer=%5BREDACTED%5D)\n - [** Firefox for iOS ** ](https://apps.apple.com/us/app/apple-store/id989804926)\n\n [Firefox Privacy Notice](https://www.mozilla.org/en-US/privacy/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## 155.0.1 Firefox Release\n\n\n\nSeptember 4, 2026\n\n\n\n\n\nVersion 155.0.1, first offered to Release channel users on September 4, 2026\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Fixed\n\n\n\n\n\n\n -\n\n\n\nFixed Firefox becoming unresponsive on some pages that use CSS blur and backdrop filters together. ([Bug 2068836](https://bugzilla.mozilla.org/show_bug.cgi?id=%5BREDACTED%5D))\n\n\n\n\n -\n\n\n\nFixed the sidebar not reappearing after restarting Firefox when the \"Hide tabs and sidebar\" option was turned on. ([Bug 2065431](https://bugzilla.mozilla.org/show_bug.cgi?id=%5BREDACTED%5D))\n\n\n\n\n -\n\n\n\nFixed some profile icons not being displayed in the account and application menus. ([Bug 2064729](https://bugzilla.mozilla.org/show_bug.cgi?id=%5BREDACTED%5D), [Bug 2067734](https://bugzilla.mozilla.org/show_bug.cgi?id=%5BREDACTED%5D))\n\n\n\n\n -\n\n\n\nFixed the current device being listed among connected devices in the account menu. ([Bug 2059763](https://bugzilla.mozilla.org/show_bug.cgi?id=%5BREDACTED%5D))\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n -\n\n\n\nReference link to [155.0 release notes](https://www.firefox.com/firefox/155.0/releasenotes/).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Unresolved\n\n\n\n\n\n\n -\n\n\n\nStandard dynamic range (SDR) video in some formats can appear washed out on macOS. The issue is under investigation and a fix will ship in a future release. ([Bug 2068961](https://bugzilla.mozilla.org/show_bug.cgi?id=%5BREDACTED%5D))\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Get the most recent version\n\n\n\n\n\n\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Android ](https://play.google.com/store/apps/details?id=%5BREDACTED%5D&referrer=%5BREDACTED%5D)\n- [iOS ](https://apps.apple.com/us/app/apple-store/id989804926)\n\n\n\n\n\n\n\n\n\nYour system may not meet the requirements for Firefox, but you can try one of these versions:\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Android ](https://play.google.com/store/apps/details?id=%5BREDACTED%5D&referrer=%5BREDACTED%5D)\n- [iOS ](https://apps.apple.com/us/app/apple-store/id989804926)\n\n\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-windows-7-8-and-81-moving-extended-support) on Windows 8.1 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n\n\n [Download Firefox ESR 64-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n [Download Firefox ESR 32-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n [Download a different build](/en-US/download/all/desktop-esr/)\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support) on macOS 10.14 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n [Download Firefox ESR](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download for Linux 64-bit ** ](/thanks/)\n - [** Download for Linux ARM64 ** ](/thanks/)\n - [** Firefox for Android ** ](https://play.google.com/store/apps/details?id=%5BREDACTED%5D&referrer=%5BREDACTED%5D)\n - [** Firefox for iOS ** ](https://apps.apple.com/us/app/apple-store/id989804926)\n\n [Firefox Privacy Notice](https://www.mozilla.org/en-US/privacy/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Need help or want to leave feedback?\n\n [File a bug](https://bugzilla.mozilla.org/enter_bug.cgi) [Leave feedback](https://connect.mozilla.org/)\n\n\n\n\n\n## Get Involved\n\n\n\nDid you know that most of the content in Firefox Support was written by volunteers?\n\n [Find out more](https://support.mozilla.org/get-involved)\n\n\n\n\n\n## Other Resources\n\n [Developer Information](https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/155) [Complete list of changes for this release](https://bugzilla.mozilla.org/buglist.cgi?j_top=%5BREDACTED%5D&f1=%5BREDACTED%5D&o3=%5BREDACTED%5D&v3=%5BREDACTED%5D&o1=%5BREDACTED%5D&resolution=%5BREDACTED%5D&o2=%5BREDACTED%5D&query_format=%5BREDACTED%5D&f3=%5BREDACTED%5D&f2=%5BREDACTED%5D&bug_status=%5BREDACTED%5D&bug_status=%5BREDACTED%5D&bug_status=%5BREDACTED%5D&v1=%5BREDACTED%5D&v2=%5BREDACTED%5D&limit=%5BREDACTED%5D) [Press Kit](https://blog.mozilla.org/press/kits/) [Mozilla and Firefox News](https://blog.mozilla.org) [Firefox Extended Support Release](/en-US/browsers/enterprise/) [All Firefox for Desktop Releases](/en-US/releases/) [Learn more about Firefox](/en-US/more/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Download\n\n\n - [Download Firefox](/thanks/)\n - [Windows](/en-US/download/windows/)\n - [macOS](/en-US/download/mac/)\n - [iOS](/en-US/download/ios/)\n - [Android](/en-US/download/android/)\n - [Linux](/en-US/download/linux/)\n - [Custom Download Options](/en-US/download/all/)\n\n\n\n\n\n\n\n\n\n## Latest Builds\n\n\n - [Nightly](/en-US/channel/desktop/#nightly)\n - [Beta](/en-US/channel/desktop/#beta)\n\n\n\n\n\n\n\n## Firefox for Business\n\n\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n\n\n\n\n\n\n\n## Community\n\n\n - [Connect](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Contribute](https://www.mozilla.org/contribute/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Developer](/en-US/channel/desktop/developer/)\n\n\n\n\n\n\n\n## Resources\n\n\n - [Compare](/en-US/compare/)\n - [Release Notes](/en-US/firefox/notes/)\n - [Learn](/en-US/more/)\n - [Merch store](https://shop.mozilla.com/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Add-ons](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Community](https://community.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n## Follow Us\n\n\n - [Instagram](https://www.instagram.com/firefox/)\n - [YouTube](https://www.youtube.com/user/firefoxchannel)\n - [TikTok](https://www.tiktok.com/@firefox)\n - [Bluesky](https://bsky.app/profile/firefox.com)\n - [Podcast](https://www.youtube.com/@firefox/podcasts)\n\n\n\n\n\n [Language](/locales/) Language\n\n English (Canadian) English (British) English\n\n Go\n\n\n\n### [Powered by Mozilla](https://www.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n [Ask us a question!](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Download\n\n\n - [Download Firefox](/thanks/)\n - [Windows](/en-US/download/windows/)\n - [macOS](/en-US/download/mac/)\n - [iOS](/en-US/download/ios/)\n - [Android](/en-US/download/android/)\n - [Linux](/en-US/download/linux/)\n - [Custom Download Options](/en-US/download/all/)\n\n\n\n\n\n\n\n## Resources\n\n\n - [Compare](/en-US/compare/)\n - [Release Notes](/en-US/firefox/notes/)\n - [Learn](/en-US/more/)\n - [Merch store](https://shop.mozilla.com/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Add-ons](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Community](https://community.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Latest Builds\n\n\n - [Nightly](/en-US/channel/desktop/#nightly)\n - [Beta](/en-US/channel/desktop/#beta)\n\n\n\n\n\n\n\n## Firefox for Business\n\n\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n\n\n\n\n\n\n\n## Community\n\n\n - [Connect](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Contribute](https://www.mozilla.org/contribute/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Developer](/en-US/channel/desktop/developer/)\n\n\n\n\n\n\n\n## Follow Us\n\n\n - [Instagram](https://www.instagram.com/firefox/)\n - [YouTube](https://www.youtube.com/user/firefoxchannel)\n - [TikTok](https://www.tiktok.com/@firefox)\n - [Bluesky](https://bsky.app/profile/firefox.com)\n - [Podcast](https://www.youtube.com/@firefox/podcasts)\n\n\n\n\n\n\n\n [Language](/locales/) Language\n\n English (Canadian) English (British) English\n\n Go\n\n\n\n### [Powered by Mozilla](https://www.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n [Ask us a question!](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n - [Website Privacy Notice](https://www.mozilla.org/en-US/privacy/websites/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Terms of Use](https://www.mozilla.org/about/legal/terms/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Cookie Policy](/en-US/privacy/websites/cookie-settings/)\n - [Community Participation Guidelines](https://www.mozilla.org/en-US/about/governance/policies/participation/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Logo Trademark Licensing](https://www.mozilla.org/foundation/trademarks/policy/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n## Help us improve your firefox.com experience\n\n\n\n\n\nIn addition to Cookies necessary for this site to function, we’d like your permission to set some additional Cookies to better understand your browsing needs and improve your experience. Rest assured — we value your privacy.\n\n\n\n Accept All Additional Cookies Reject All Additional Cookies\n\n\n\n[Cookie settings](/en-US/privacy/websites/cookie-settings/)",
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"content": "Firefox 155.0, See All New Features, Updates and Fixes\n\n\n\n [](/en-US/)\n\n\n - Browser\n\n\n\n\n\n\n - [Mobile](/en-US/mobile/)\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n - [What’s New](/en-US/whatsnew/?from_main_nav=true)\n - [What’s Next](/en-US/whatsnext/)\n\n\n - [Extensions & Themes](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n [Download Firefox](/en-US/download/)\n\n\n\n\n\n\n - [Features](/en-US/features/)\n\n\n\n\n\n\n - [Protection](/en-US/features/protection/)\n - [Control](/en-US/features/control/)\n - [Focus](/en-US/features/focus/)\n - [About Firefox features](/en-US/features/)\n\n [View all Firefox Features](/en-US/features/all/)\n\n\n\n\n\n\n - Resources\n\n\n\n\n\n\n - [Data Protection](/en-US/user-privacy/)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Podcast](https://www.youtube.com/@firefox/podcasts?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n - [Newsletter](/en-US/newsletter/)\n - [Release Notes](/en-US/firefox/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Get Firefox](/thanks/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Get Firefox](/thanks/)\n\n\n\n\n\n\n\n\n\n\n\n Firefox for mobile\n\n\n\n  [Get Firefox on your phone](/en-US/mobile/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n Menu\n\n\n\n Menu\n - Browser\n\n\n\n\n\n\n - [Mobile](/en-US/mobile/)\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n - [What’s New](/en-US/whatsnew/?from_main_nav=true)\n - [What’s Next](/en-US/whatsnext/)\n\n\n - [Extensions & Themes](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n [Download Firefox](/en-US/download/)\n\n\n\n\n\n\n - [Features](/en-US/features/)\n\n\n\n\n\n\n - [Protection](/en-US/features/protection/)\n - [Control](/en-US/features/control/)\n - [Focus](/en-US/features/focus/)\n - [About Firefox features](/en-US/features/)\n\n [View all Firefox Features](/en-US/features/all/)\n\n\n\n\n\n\n - Resources\n\n\n\n\n\n\n - [Data Protection](/en-US/user-privacy/)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Podcast](https://www.youtube.com/@firefox/podcasts?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n - [Newsletter](/en-US/newsletter/)\n - [Release Notes](/en-US/firefox/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Release Notes\n\n Menu **\n - [Desktop](/en-US/firefox/notes/)\n - [Desktop Beta & Developer Edition](/en-US/firefox/beta/notes/)\n - [Desktop Nightly](/en-US/firefox/nightly/notes/)\n - [Android](/en-US/firefox/android/155.0.1/releasenotes/)\n - [iOS](/en-US/firefox/ios/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n \n\n\n\n# Firefox Release Notes\n\n\n\nRelease Notes tell you what's new in Firefox. As always, we welcome your [feedback](https://connect.mozilla.org/). You can also [file a bug in Bugzilla](https://bugzilla.mozilla.org/enter_bug.cgi) or see the [system requirements](/en-US/firefox/155.0/system-requirements/) of this release.\n\n\n\n\n\n\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Android ](https://play.google.com/store/apps/details?id=%5BREDACTED%5D&referrer=%5BREDACTED%5D)\n- [iOS ](https://apps.apple.com/us/app/apple-store/id989804926)\n\n\n\n\n\n\n\n\n\nYour system may not meet the requirements for Firefox, but you can try one of these versions:\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Android ](https://play.google.com/store/apps/details?id=%5BREDACTED%5D&referrer=%5BREDACTED%5D)\n- [iOS ](https://apps.apple.com/us/app/apple-store/id989804926)\n\n\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-windows-7-8-and-81-moving-extended-support) on Windows 8.1 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n\n\n [Download Firefox ESR 64-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n [Download Firefox ESR 32-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n [Download a different build](/en-US/download/all/desktop-esr/)\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support) on macOS 10.14 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n [Download Firefox ESR](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download for Linux 64-bit ** ](/thanks/)\n - [** Download for Linux ARM64 ** ](/thanks/)\n - [** Firefox for Android ** ](https://play.google.com/store/apps/details?id=%5BREDACTED%5D&referrer=%5BREDACTED%5D)\n - [** Firefox for iOS ** ](https://apps.apple.com/us/app/apple-store/id989804926)\n\n [Firefox Privacy Notice](https://www.mozilla.org/en-US/privacy/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## 155.0 Firefox Release\n\n\n\nSeptember 1, 2026\n\n\n\n\n\nVersion 155.0, first offered to Release channel users on September 1, 2026\n\n\n\n\n\n\n\n\n\n\n - [Previous Firefox 154.0](/en-US/firefox/154.0/releasenotes/)\n\n\n\n\n\n\n\n\n\n\n\n### New\n\n\n\n\n\n\n -\n\n\n\n[Smart Window](https://www.firefox.com/smart-window) is now available for all users in the USA, Canada, and France to try out! Additionally, Firefox 155 includes many new enhancements:\n\n\n - New personalized resume conversation starters help users quickly return to topics they’ve been working on.\n\n\n\n\n\n\n - Assistant now responds much faster with Exa web search source citations to provide accurate, trustworthy web grounding in roughly 1/5 the time.\n\n\n\n\n\n\n - Organize Tabs now suggests better groupings of your related tabs and gives each group a clearer, more descriptive name.\n\n\n\n\n\n\n\n\n\n \n\nThis feature is part of a progressive roll out.\n\n What is a progressive roll out?\n\nCertain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.\n\n\n\n\n -\n\n\n\nFirefox now shows how many trackers it has blocked in the address bar, making built-in privacy protections easier to see while browsing. The count can be [hidden in settings](https://support.mozilla.org/kb/enhanced-tracking-protection-firefox-desktop#[REDACTED]) without turning off tracker blocking.\n\n\n\n\n\n \n\nThis feature is part of a progressive roll out.\n\n What is a progressive roll out?\n\nCertain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.\n\n\n\n\n -\n\n\n\nNintendo Switch Pro and compatible aftermarket controllers now work fully in web games on Windows, with the directional pad and analog sticks correctly mapped.\n\n\n\n\n -\n\n\n\n[Containers](https://support.mozilla.org/kb/how-use-firefox-containers) can now be reordered in Settings, and the new order is used wherever containers are listed.\n\n\n\n\n\n\n\n\n -\n\n\n\nThe [Translations](https://support.mozilla.org/kb/website-translation) feature now supports the following languages:\n\n\n - Marathi\n - Urdu\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Fixed\n\n\n\n\n\n\n -\n\n\n\nFixed text disappearing in Microsoft 365 Word Online and other web apps on Linux when typing with certain keyboard layouts.\n\n\n\n\n -\n\n\n\nFixed an unnecessary paste confirmation appearing when using the keyboard shortcut to paste without formatting in Google Docs.\n\n\n\n\n -\n\n\n\nFirefox now recovers from the toolbar and tab strip being left unresponsive when the platform fails to end a tab drag session.\n\n\n\n\n -\n\n\n\nFixed text inside buttons not being selectable or copyable, which prevented copying direct messages on X and comments on YouTube.\n\n\n\n\n -\n\n\n\nFixed live audio streams such as internet radio stopping when playing in the background.\n\n\n\n\n -\n\n\n\nFixed the sound indicator disappearing from a tab that was moved to another window, leaving no way to see or mute what was playing.\n\n\n\n\n -\n\n\n\nFixed Firefox preventing Linux systems from going to sleep after a long browsing session.\n\n\n\n\n -\n\n\n\nFixed full screen content being letterboxed on MacBooks with a camera notch, most visibly when watching video.\n\n\n\n\n -\n\n\n\nFixed arrow-key and Page Up/Down scrolling not working on some pages with embedded content from other sites.\n\n\n\n\n -\n\n\n\nFixed characters from some less common scripts appearing as empty boxes on web pages on Windows.\n\n\n\n\n -\n\n\n\nFixed WebCodecs `VideoEncoder` hanging on macOS when encoding a `VideoFrame` in NV12 format.\n\n\n\n\n -\n\n\n\nVarious [security fixes](https://www.mozilla.org/security/advisories/mfsa2026-82/).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Changed\n\n\n\n\n\n\n -\n\n\n\nFirefox now limits CSS to 75 levels of nested blocks and functions, preventing crashes that extremely deep nesting can cause under some circumstances. More deeply nested rules and values no longer parse.\n\n\n\n\n -\n\n\n\nFirefox now uses firefox-portal-detection.com instead of detectportal.firefox.com to detect captive portals and check network connectivity, so network allowlists referencing the old domain need updating.\n\n\n\n\n -\n\n\n\nFirefox now opens mailto: links only in response to an explicit user action, so pages can no longer launch the default mail client unprompted.\n\n\n\n\n -\n\n\n\nPDFs smaller than the paper size can now be enlarged to fill the sheet when printing, by setting the scale above 100%.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Enterprise\n\n\n\n\n\n\n -\n\n\n\nYou can find information about policy updates and enterprise-specific bug fixes in the [Firefox for Enterprise 155 Release Notes](https://firefox-admin-docs.mozilla.org/release-notes/version/firefox-155/).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Developer\n\n\n\n\n\n\n -\n\n [Developer Information](https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/155)\n\n\n -\n\n\n\nThe Rules View now offers toggles to emulate the [`prefers-reduced-motion`](https://developer.mozilla.org/docs/Web/CSS/Reference/At-rules/@media/prefers-reduced-motion) media feature. Emulation options have also moved into a new panel behind the at-rules (`@`) button.\n\n\n\n\n -\n\n\n\nThe Debugger in Developer Tools now has a keyboard shortcut, Ctrl+Alt+B (Cmd+Alt+B on macOS), to enable or disable all breakpoints at once.\n\n\n\n\n -\n\n\n\nThe JSON Viewer now displays JSON Lines (JSONL/NDJSON) documents, including inline errors for invalid lines.\n\n\n\n\n -\n\n\n\nFixed the Storage panel showing cookies from private windows, containers, and other partitions alongside the inspected page's own cookies.\n\n\n\n\n -\n\n\n\nUncaught non-`Error` exceptions now list their property names in the Console instead of showing only `Object`.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Web Platform\n\n\n\n\n\n\n -\n\n\n\nThe CSS [`attr()`](https://developer.mozilla.org/docs/Web/CSS/Reference/Values/attr) function now supports values of any type, so authors can use attribute values in any property rather than only as strings in the `content` property.\n\n\n\n\n -\n\n\n\nFirefox now supports the [`progress()`](https://developer.mozilla.org/docs/Web/CSS/Reference/Values/progress) CSS function.\n\n\n\n\n -\n\n\n\nFirefox now supports the [`alpha()`](https://developer.mozilla.org/docs/Web/CSS/Reference/Values/color_value/alpha) CSS function. This is a relative color function that can be used to modify just the alpha component of a given color.\n\n\n\n\n -\n\n\n\nFirefox now supports the `Promise.allKeyed` and `Promise.allSettledKeyed` methods from the await dictionary proposal, which take an object of promises and resolve to an object of results with the same keys.\n\n\n\n\n -\n\n\n\nFirefox now supports the WebAssembly Compact Import Section proposal, which can reduce the size of WebAssembly modules with many imports.\n\n\n\n\n -\n\n\n\nFirefox now supports the WebAssembly Wide Arithmetic proposal, which adds 128-bit arithmetic instructions for better performance in cryptography and arbitrary-precision math.\n\n\n\n\n -\n\n\n\nFirefox now supports QUIC version 2 ([RFC 9369](https://www.rfc-editor.org/rfc/rfc9369.html)) for HTTP/3 connections, and uses it when the server selects it through compatible version negotiation ([RFC 9368](https://www.rfc-editor.org/rfc/rfc9368.html)).\n\n\n\n\n -\n\n\n\nSupport for the non-standard `::-webkit-scrollbar` pseudo-element, added in Firefox 153, is now limited to a small list of sites rather than applying universally.\n\n\n\n\n -\n\n\n\nSVG `<a>` elements now expose the same [URL properties](https://developer.mozilla.org/docs/Web/API/HTMLAnchorElement#[REDACTED]) as HTML links, including `protocol`, `host`, `pathname`, and `search`.\n\n\n\n\n -\n\n\n\n`SVGGraphicsElement.getBBox()` now honors its [`options`](https://developer.mozilla.org/docs/Web/API/SVGGraphicsElement/getBBox#[REDACTED]) argument, so bounding boxes can include stroke, markers, and clipping.\n\n\n\n\n -\n\n\n\nThe `font-width` property is now supported as the standard name for `font-stretch`.\n\n\n\n\n -\n\n\n\nA dynamic `import()` that fails due to a network or HTTP error is no longer cached as a failure in the module map, so retrying the same specifier can now succeed.\n\n\n\n\n -\n\n\n\nWebTransport now supports send groups (`createSendGroup()`) for controlling how bandwidth is shared between streams, writable datagram streams (`createWritable()`), and `exportKeyingMaterial()` for deriving keys bound to the TLS session. It also adds a `draining` promise and subprotocol negotiation through the constructor's `protocols` option and the `protocol` property.\n\n\n\n\n -\n\n\n\nFirefox now supports `RTCError` for data channel failures, `RTCSctpTransport.maxChannels`, two-byte RTP header extension IDs, and more accurate `RTCTransportStats`, improving WebRTC interoperability.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Unresolved\n\n\n\n\n\n\n -\n\n\n\nFor users with vertical tabs enabled, the sidebar may not persist across Firefox restarts. Vertical tabs can be re-enabled after the restart by clicking the sidebar toolbar button. A fix is available in [Firefox 155.0.1](https://www.firefox.com/firefox/155.0.1/releasenotes/).\n\n\n\n\n -\n\n\n\nSome sites may load slowly or fail to load on networks that block UDP. This can affect e.g. corporate networks where a proxy or firewall blocks QUIC as part of TLS inspection. To work around it, set `network.http.happy_eyeballs_enabled` to `false` with the `Preferences` policy. A fix is available in [Firefox 155.0.1](https://www.firefox.com/firefox/155.0.1/releasenotes/). ([Bug 2063452](https://bugzilla.mozilla.org/show_bug.cgi?id=%5BREDACTED%5D))\n\n\n\n\n -\n\n\n\nStandard dynamic range (SDR) video in some formats can appear washed out on macOS. The issue is under investigation and a fix will ship in a future release. ([Bug 2068961](https://bugzilla.mozilla.org/show_bug.cgi?id=%5BREDACTED%5D))\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Community Contributions\n\n\n\n\n\n\n -\n\n\n\nWith the release of Firefox 155, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 20 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:\n\n\n - Artem Bilous: [2056733](https://bugzilla.mozilla.org/2056733)\n - Cameron: [2052559](https://bugzilla.mozilla.org/2052559), [2052619](https://bugzilla.mozilla.org/2052619)\n - Colden Cullen: [2060708](https://bugzilla.mozilla.org/2060708)\n - Dan: [1735300](https://bugzilla.mozilla.org/1735300)\n - Fede: [1418178](https://bugzilla.mozilla.org/1418178), [2040498](https://bugzilla.mozilla.org/2040498), [2046774](https://bugzilla.mozilla.org/2046774)\n - Giulio B: [2048884](https://bugzilla.mozilla.org/2048884)\n - K: [1642578](https://bugzilla.mozilla.org/1642578)\n - Kevin Gosse: [2054036](https://bugzilla.mozilla.org/2054036)\n - Michael F: [2052438](https://bugzilla.mozilla.org/2052438)\n - mikey gough: [2053551](https://bugzilla.mozilla.org/2053551)\n - munawiki: [2055309](https://bugzilla.mozilla.org/2055309)\n - Nathan Leuz: [2053550](https://bugzilla.mozilla.org/2053550)\n - Nirmal Advani: [1804108](https://bugzilla.mozilla.org/1804108), [2003174](https://bugzilla.mozilla.org/2003174), [2003177](https://bugzilla.mozilla.org/2003177), [2003181](https://bugzilla.mozilla.org/2003181), [2031618](https://bugzilla.mozilla.org/2031618), [2033570](https://bugzilla.mozilla.org/2033570), [2046156](https://bugzilla.mozilla.org/2046156), [2052618](https://bugzilla.mozilla.org/2052618), [2053543](https://bugzilla.mozilla.org/2053543), [2053566](https://bugzilla.mozilla.org/2053566), [2053568](https://bugzilla.mozilla.org/2053568), [2053977](https://bugzilla.mozilla.org/2053977), [2058556](https://bugzilla.mozilla.org/2058556), [2059866](https://bugzilla.mozilla.org/2059866), [2060649](https://bugzilla.mozilla.org/2060649)\n - Priyanshu[:0xanshu]: [1977947](https://bugzilla.mozilla.org/1977947)\n - Richard Van Natta[:rnvannatta]: [2052617](https://bugzilla.mozilla.org/2052617)\n - Ruhollah Majdoddin: [1856645](https://bugzilla.mozilla.org/1856645), [2060029](https://bugzilla.mozilla.org/2060029), [2061166](https://bugzilla.mozilla.org/2061166), [2061348](https://bugzilla.mozilla.org/2061348)\n - Shawn Zivontsis: [2025999](https://bugzilla.mozilla.org/2025999)\n - Simon Rosen: [1875517](https://bugzilla.mozilla.org/1875517)\n - Yuxiao Zhu: [1861034](https://bugzilla.mozilla.org/1861034)\n - Zyphrenn: [2033961](https://bugzilla.mozilla.org/2033961), [2059969](https://bugzilla.mozilla.org/2059969)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n - [Previous Firefox 154.0](/en-US/firefox/154.0/releasenotes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Get the most recent version\n\n\n\n\n\n\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Android ](https://play.google.com/store/apps/details?id=%5BREDACTED%5D&referrer=%5BREDACTED%5D)\n- [iOS ](https://apps.apple.com/us/app/apple-store/id989804926)\n\n\n\n\n\n\n\n\n\nYour system may not meet the requirements for Firefox, but you can try one of these versions:\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Android ](https://play.google.com/store/apps/details?id=%5BREDACTED%5D&referrer=%5BREDACTED%5D)\n- [iOS ](https://apps.apple.com/us/app/apple-store/id989804926)\n\n\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-windows-7-8-and-81-moving-extended-support) on Windows 8.1 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n\n\n [Download Firefox ESR 64-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n [Download Firefox ESR 32-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n [Download a different build](/en-US/download/all/desktop-esr/)\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support) on macOS 10.14 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n [Download Firefox ESR](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download Firefox ** ](/thanks/)\n - [** Download for Linux 64-bit ** ](/thanks/)\n - [** Download for Linux ARM64 ** ](/thanks/)\n - [** Firefox for Android ** ](https://play.google.com/store/apps/details?id=%5BREDACTED%5D&referrer=%5BREDACTED%5D)\n - [** Firefox for iOS ** ](https://apps.apple.com/us/app/apple-store/id989804926)\n\n [Firefox Privacy Notice](https://www.mozilla.org/en-US/privacy/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Need help or want to leave feedback?\n\n [File a bug](https://bugzilla.mozilla.org/enter_bug.cgi) [Leave feedback](https://connect.mozilla.org/)\n\n\n\n\n\n## Get Involved\n\n\n\nDid you know that most of the content in Firefox Support was written by volunteers?\n\n [Find out more](https://support.mozilla.org/get-involved)\n\n\n\n\n\n## Other Resources\n\n [Developer Information](https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/155) [Complete list of changes for this release](https://bugzilla.mozilla.org/buglist.cgi?j_top=%5BREDACTED%5D&f1=%5BREDACTED%5D&o3=%5BREDACTED%5D&v3=%5BREDACTED%5D&o1=%5BREDACTED%5D&resolution=%5BREDACTED%5D&o2=%5BREDACTED%5D&query_format=%5BREDACTED%5D&f3=%5BREDACTED%5D&f2=%5BREDACTED%5D&bug_status=%5BREDACTED%5D&bug_status=%5BREDACTED%5D&bug_status=%5BREDACTED%5D&v1=%5BREDACTED%5D&v2=%5BREDACTED%5D&limit=%5BREDACTED%5D) [Press Kit](https://blog.mozilla.org/press/kits/) [Mozilla and Firefox News](https://blog.mozilla.org) [Firefox Extended Support Release](/en-US/browsers/enterprise/) [All Firefox for Desktop Releases](/en-US/releases/) [Learn more about Firefox](/en-US/more/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Download\n\n\n - [Download Firefox](/thanks/)\n - [Windows](/en-US/download/windows/)\n - [macOS](/en-US/download/mac/)\n - [iOS](/en-US/download/ios/)\n - [Android](/en-US/download/android/)\n - [Linux](/en-US/download/linux/)\n - [Custom Download Options](/en-US/download/all/)\n\n\n\n\n\n\n\n\n\n## Latest Builds\n\n\n - [Nightly](/en-US/channel/desktop/#nightly)\n - [Beta](/en-US/channel/desktop/#beta)\n\n\n\n\n\n\n\n## Firefox for Business\n\n\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n\n\n\n\n\n\n\n## Community\n\n\n - [Connect](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Contribute](https://www.mozilla.org/contribute/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Developer](/en-US/channel/desktop/developer/)\n\n\n\n\n\n\n\n## Resources\n\n\n - [Compare](/en-US/compare/)\n - [Release Notes](/en-US/firefox/notes/)\n - [Learn](/en-US/more/)\n - [Merch store](https://shop.mozilla.com/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Add-ons](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Community](https://community.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n## Follow Us\n\n\n - [Instagram](https://www.instagram.com/firefox/)\n - [YouTube](https://www.youtube.com/user/firefoxchannel)\n - [TikTok](https://www.tiktok.com/@firefox)\n - [Bluesky](https://bsky.app/profile/firefox.com)\n - [Podcast](https://www.youtube.com/@firefox/podcasts)\n\n\n\n\n\n [Language](/locales/) Language\n\n English (Canadian) English (British) English\n\n Go\n\n\n\n### [Powered by Mozilla](https://www.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n [Ask us a question!](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Download\n\n\n - [Download Firefox](/thanks/)\n - [Windows](/en-US/download/windows/)\n - [macOS](/en-US/download/mac/)\n - [iOS](/en-US/download/ios/)\n - [Android](/en-US/download/android/)\n - [Linux](/en-US/download/linux/)\n - [Custom Download Options](/en-US/download/all/)\n\n\n\n\n\n\n\n## Resources\n\n\n - [Compare](/en-US/compare/)\n - [Release Notes](/en-US/firefox/notes/)\n - [Learn](/en-US/more/)\n - [Merch store](https://shop.mozilla.com/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Add-ons](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Community](https://community.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Latest Builds\n\n\n - [Nightly](/en-US/channel/desktop/#nightly)\n - [Beta](/en-US/channel/desktop/#beta)\n\n\n\n\n\n\n\n## Firefox for Business\n\n\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n\n\n\n\n\n\n\n## Community\n\n\n - [Connect](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Contribute](https://www.mozilla.org/contribute/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Developer](/en-US/channel/desktop/developer/)\n\n\n\n\n\n\n\n## Follow Us\n\n\n - [Instagram](https://www.instagram.com/firefox/)\n - [YouTube](https://www.youtube.com/user/firefoxchannel)\n - [TikTok](https://www.tiktok.com/@firefox)\n - [Bluesky](https://bsky.app/profile/firefox.com)\n - [Podcast](https://www.youtube.com/@firefox/podcasts)\n\n\n\n\n\n\n\n [Language](/locales/) Language\n\n English (Canadian) English (British) English\n\n Go\n\n\n\n### [Powered by Mozilla](https://www.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n [Ask us a question!](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n - [Website Privacy Notice](https://www.mozilla.org/en-US/privacy/websites/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Terms of Use](https://www.mozilla.org/about/legal/terms/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Cookie Policy](/en-US/privacy/websites/cookie-settings/)\n - [Community Participation Guidelines](https://www.mozilla.org/en-US/about/governance/policies/participation/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Logo Trademark Licensing](https://www.mozilla.org/foundation/trademarks/policy/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n## Help us improve your firefox.com experience\n\n\n\n\n\nIn addition to Cookies necessary for this site to function, we’d like your permission to set some additional Cookies to better understand your browsing needs and improve your experience. Rest assured — we value your privacy.\n\n\n\n Accept All Additional Cookies Reject All Additional Cookies\n\n\n\n[Cookie settings](/en-US/privacy/websites/cookie-settings/)",
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"content": "Firefox ESR 153.2.0, See All New Features, Updates and Fixes\n\n\n\n [](/en-US/)\n\n\n - Browser\n\n\n\n\n\n\n - [Mobile](/en-US/mobile/)\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n - [What’s New](/en-US/whatsnew/?from_main_nav=true)\n - [What’s Next](/en-US/whatsnext/)\n\n\n - [Extensions & Themes](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n [Download Firefox](/en-US/download/)\n\n\n\n\n\n\n - [Features](/en-US/features/)\n\n\n\n\n\n\n - [Protection](/en-US/features/protection/)\n - [Control](/en-US/features/control/)\n - [Focus](/en-US/features/focus/)\n - [About Firefox features](/en-US/features/)\n\n [View all Firefox Features](/en-US/features/all/)\n\n\n\n\n\n\n - Resources\n\n\n\n\n\n\n - [Data Protection](/en-US/user-privacy/)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Podcast](https://www.youtube.com/@firefox/podcasts?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n - [Newsletter](/en-US/newsletter/)\n - [Release Notes](/en-US/firefox/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Get Firefox](/thanks/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Get Firefox](/thanks/)\n\n\n\n\n\n\n\n\n\n\n\n Firefox for mobile\n\n\n\n  [Get Firefox on your phone](/en-US/mobile/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n Menu\n\n\n\n Menu\n - Browser\n\n\n\n\n\n\n - [Mobile](/en-US/mobile/)\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n - [What’s New](/en-US/whatsnew/?from_main_nav=true)\n - [What’s Next](/en-US/whatsnext/)\n\n\n - [Extensions & Themes](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n [Download Firefox](/en-US/download/)\n\n\n\n\n\n\n - [Features](/en-US/features/)\n\n\n\n\n\n\n - [Protection](/en-US/features/protection/)\n - [Control](/en-US/features/control/)\n - [Focus](/en-US/features/focus/)\n - [About Firefox features](/en-US/features/)\n\n [View all Firefox Features](/en-US/features/all/)\n\n\n\n\n\n\n - Resources\n\n\n\n\n\n\n - [Data Protection](/en-US/user-privacy/)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Podcast](https://www.youtube.com/@firefox/podcasts?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n - [Newsletter](/en-US/newsletter/)\n - [Release Notes](/en-US/firefox/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Release Notes\n\n Menu **\n - [Desktop](/en-US/firefox/notes/)\n - [Desktop Beta & Developer Edition](/en-US/firefox/beta/notes/)\n - [Desktop Nightly](/en-US/firefox/nightly/notes/)\n - [Android](/en-US/firefox/android/notes/)\n - [iOS](/en-US/firefox/ios/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n \n\n\n\n# Firefox ESR\n Release Notes\n\n\n\nRelease Notes tell you what's new in Firefox. As always, we welcome your [feedback](https://connect.mozilla.org/). You can also [file a bug in Bugzilla](https://bugzilla.mozilla.org/enter_bug.cgi) or see the [system requirements](/en-US/firefox/153.2.0/system-requirements/) of this release.\n\n\n\n\n\n\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\nYour system may not meet the requirements for Firefox, but you can try one of these versions:\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-windows-7-8-and-81-moving-extended-support) on Windows 8.1 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n\n\n [Download Firefox ESR 64-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n [Download Firefox ESR 32-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n [Download a different build](/en-US/download/all/desktop-esr/)\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support) on macOS 10.14 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n [Download Firefox ESR](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download for Linux 64-bit ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download for Linux ARM64 ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download for Linux 32-bit ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n [Firefox Privacy Notice](https://www.mozilla.org/en-US/privacy/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## 153.2.0 Firefox ESR\n\n\n\nSeptember 1, 2026\n\n\n\n\n\nVersion 153.2.0, first offered to ESR channel users on September 1, 2026\n\n\n\nFirefox 153 Extended Support Release (ESR) includes all of the enhancements since Firefox 140, along with many new features to make your enterprise deployments easier and even more flexible.\n\n\n\n\n\n\n\n\n - [Previous Firefox 140.0esr](/en-US/firefox/140.0esr/releasenotes/)\n\n\n\n\n\n\n\n\n\n\n\n### Fixed\n\n\n\n\n\n\n -\n\n\n\nVarious [security fixes](https://www.mozilla.org/security/advisories/mfsa2026-85/).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Developer\n\n\n\n\n\n\n -\n\n [Developer Information](https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/153)\n\n\n\n\n\n\n\n\n\n\n\n\n -\n\n\n\nReference link to [ESR 153.0 release notes](https://www.mozilla.org/firefox/153.0esr/releasenotes/).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n - [Previous Firefox 140.0esr](/en-US/firefox/140.0esr/releasenotes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Get the most recent version\n\n\n\n\n\n\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\nYour system may not meet the requirements for Firefox, but you can try one of these versions:\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-windows-7-8-and-81-moving-extended-support) on Windows 8.1 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n\n\n [Download Firefox ESR 64-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n [Download Firefox ESR 32-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n [Download a different build](/en-US/download/all/desktop-esr/)\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support) on macOS 10.14 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n [Download Firefox ESR](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download for Linux 64-bit ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download for Linux ARM64 ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download for Linux 32-bit ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n [Firefox Privacy Notice](https://www.mozilla.org/en-US/privacy/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Need help or want to leave feedback?\n\n [File a bug](https://bugzilla.mozilla.org/enter_bug.cgi) [Leave feedback](https://connect.mozilla.org/)\n\n\n\n\n\n## Get Involved\n\n\n\nDid you know that most of the content in Firefox Support was written by volunteers?\n\n [Find out more](https://support.mozilla.org/get-involved)\n\n\n\n\n\n## Other Resources\n\n [Developer Information](https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/153) [Complete list of changes for this release](https://bugzilla.mozilla.org/buglist.cgi?j_top=%5BREDACTED%5D&f1=%5BREDACTED%5D&o3=%5BREDACTED%5D&v3=%5BREDACTED%5D&o1=%5BREDACTED%5D&resolution=%5BREDACTED%5D&o2=%5BREDACTED%5D&query_format=%5BREDACTED%5D&f3=%5BREDACTED%5D&f2=%5BREDACTED%5D&bug_status=%5BREDACTED%5D&bug_status=%5BREDACTED%5D&bug_status=%5BREDACTED%5D&v1=%5BREDACTED%5D&v2=%5BREDACTED%5D&limit=%5BREDACTED%5D) [Press Kit](https://blog.mozilla.org/press/kits/) [Mozilla and Firefox News](https://blog.mozilla.org) [Firefox Extended Support Release](/en-US/browsers/enterprise/) [All Firefox for Desktop Releases](/en-US/releases/) [Learn more about Firefox](/en-US/more/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Download\n\n\n - [Download Firefox](/thanks/)\n - [Windows](/en-US/download/windows/)\n - [macOS](/en-US/download/mac/)\n - [iOS](/en-US/download/ios/)\n - [Android](/en-US/download/android/)\n - [Linux](/en-US/download/linux/)\n - [Custom Download Options](/en-US/download/all/)\n\n\n\n\n\n\n\n\n\n## Latest Builds\n\n\n - [Nightly](/en-US/channel/desktop/#nightly)\n - [Beta](/en-US/channel/desktop/#beta)\n\n\n\n\n\n\n\n## Firefox for Business\n\n\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n\n\n\n\n\n\n\n## Community\n\n\n - [Connect](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Contribute](https://www.mozilla.org/contribute/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Developer](/en-US/channel/desktop/developer/)\n\n\n\n\n\n\n\n## Resources\n\n\n - [Compare](/en-US/compare/)\n - [Release Notes](/en-US/firefox/notes/)\n - [Learn](/en-US/more/)\n - [Merch store](https://shop.mozilla.com/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Add-ons](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Community](https://community.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n## Follow Us\n\n\n - [Instagram](https://www.instagram.com/firefox/)\n - [YouTube](https://www.youtube.com/user/firefoxchannel)\n - [TikTok](https://www.tiktok.com/@firefox)\n - [Bluesky](https://bsky.app/profile/firefox.com)\n - [Podcast](https://www.youtube.com/@firefox/podcasts)\n\n\n\n\n\n [Language](/locales/) Language\n\n English (Canadian) English (British) English\n\n Go\n\n\n\n### [Powered by Mozilla](https://www.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n [Ask us a question!](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Download\n\n\n - [Download Firefox](/thanks/)\n - [Windows](/en-US/download/windows/)\n - [macOS](/en-US/download/mac/)\n - [iOS](/en-US/download/ios/)\n - [Android](/en-US/download/android/)\n - [Linux](/en-US/download/linux/)\n - [Custom Download Options](/en-US/download/all/)\n\n\n\n\n\n\n\n## Resources\n\n\n - [Compare](/en-US/compare/)\n - [Release Notes](/en-US/firefox/notes/)\n - [Learn](/en-US/more/)\n - [Merch store](https://shop.mozilla.com/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Add-ons](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Community](https://community.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Latest Builds\n\n\n - [Nightly](/en-US/channel/desktop/#nightly)\n - [Beta](/en-US/channel/desktop/#beta)\n\n\n\n\n\n\n\n## Firefox for Business\n\n\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n\n\n\n\n\n\n\n## Community\n\n\n - [Connect](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Contribute](https://www.mozilla.org/contribute/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Developer](/en-US/channel/desktop/developer/)\n\n\n\n\n\n\n\n## Follow Us\n\n\n - [Instagram](https://www.instagram.com/firefox/)\n - [YouTube](https://www.youtube.com/user/firefoxchannel)\n - [TikTok](https://www.tiktok.com/@firefox)\n - [Bluesky](https://bsky.app/profile/firefox.com)\n - [Podcast](https://www.youtube.com/@firefox/podcasts)\n\n\n\n\n\n\n\n [Language](/locales/) Language\n\n English (Canadian) English (British) English\n\n Go\n\n\n\n### [Powered by Mozilla](https://www.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n [Ask us a question!](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n - [Website Privacy Notice](https://www.mozilla.org/en-US/privacy/websites/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Terms of Use](https://www.mozilla.org/about/legal/terms/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Cookie Policy](/en-US/privacy/websites/cookie-settings/)\n - [Community Participation Guidelines](https://www.mozilla.org/en-US/about/governance/policies/participation/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Logo Trademark Licensing](https://www.mozilla.org/foundation/trademarks/policy/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n## Help us improve your firefox.com experience\n\n\n\n\n\nIn addition to Cookies necessary for this site to function, we’d like your permission to set some additional Cookies to better understand your browsing needs and improve your experience. Rest assured — we value your privacy.\n\n\n\n Accept All Additional Cookies Reject All Additional Cookies\n\n\n\n[Cookie settings](/en-US/privacy/websites/cookie-settings/)",
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"content": "Firefox ESR 140.15.0, See All New Features, Updates and Fixes\n\n\n\n [](/en-US/)\n\n\n - Browser\n\n\n\n\n\n\n - [Mobile](/en-US/mobile/)\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n - [What’s New](/en-US/whatsnew/?from_main_nav=true)\n - [What’s Next](/en-US/whatsnext/)\n\n\n - [Extensions & Themes](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n [Download Firefox](/en-US/download/)\n\n\n\n\n\n\n - [Features](/en-US/features/)\n\n\n\n\n\n\n - [Protection](/en-US/features/protection/)\n - [Control](/en-US/features/control/)\n - [Focus](/en-US/features/focus/)\n - [About Firefox features](/en-US/features/)\n\n [View all Firefox Features](/en-US/features/all/)\n\n\n\n\n\n\n - Resources\n\n\n\n\n\n\n - [Data Protection](/en-US/user-privacy/)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Podcast](https://www.youtube.com/@firefox/podcasts?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n - [Newsletter](/en-US/newsletter/)\n - [Release Notes](/en-US/firefox/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Get Firefox](/thanks/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n [Get Firefox](/thanks/)\n\n\n\n\n\n\n\n\n\n\n\n Firefox for mobile\n\n\n\n  [Get Firefox on your phone](/en-US/mobile/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n Menu\n\n\n\n Menu\n - Browser\n\n\n\n\n\n\n - [Mobile](/en-US/mobile/)\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n - [What’s New](/en-US/whatsnew/?from_main_nav=true)\n - [What’s Next](/en-US/whatsnext/)\n\n\n - [Extensions & Themes](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n [Download Firefox](/en-US/download/)\n\n\n\n\n\n\n - [Features](/en-US/features/)\n\n\n\n\n\n\n - [Protection](/en-US/features/protection/)\n - [Control](/en-US/features/control/)\n - [Focus](/en-US/features/focus/)\n - [About Firefox features](/en-US/features/)\n\n [View all Firefox Features](/en-US/features/all/)\n\n\n\n\n\n\n - Resources\n\n\n\n\n\n\n - [Data Protection](/en-US/user-privacy/)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n - [Podcast](https://www.youtube.com/@firefox/podcasts?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n - [Newsletter](/en-US/newsletter/)\n - [Release Notes](/en-US/firefox/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Release Notes\n\n Menu **\n - [Desktop](/en-US/firefox/notes/)\n - [Desktop Beta & Developer Edition](/en-US/firefox/beta/notes/)\n - [Desktop Nightly](/en-US/firefox/nightly/notes/)\n - [Android](/en-US/firefox/android/notes/)\n - [iOS](/en-US/firefox/ios/notes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n \n\n\n\n# Firefox ESR\n Release Notes\n\n\n\nRelease Notes tell you what's new in Firefox. As always, we welcome your [feedback](https://connect.mozilla.org/). You can also [file a bug in Bugzilla](https://bugzilla.mozilla.org/enter_bug.cgi) or see the [system requirements](/en-US/firefox/140.15.0/system-requirements/) of this release.\n\n\n\n\n\n\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\nYour system may not meet the requirements for Firefox, but you can try one of these versions:\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-windows-7-8-and-81-moving-extended-support) on Windows 8.1 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n\n\n [Download Firefox ESR 64-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n [Download Firefox ESR 32-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n [Download a different build](/en-US/download/all/desktop-esr/)\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support) on macOS 10.14 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n [Download Firefox ESR](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download for Linux 64-bit ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download for Linux ARM64 ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download for Linux 32-bit ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n [Firefox Privacy Notice](https://www.mozilla.org/en-US/privacy/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## 140.15.0 Firefox ESR\n\n\n\nSeptember 1, 2026\n\n\n\n\n\nVersion 140.15.0, first offered to ESR channel users on September 1, 2026\n\n\n\nFirefox 140 Extended Support Release (ESR) includes all of the enhancements since Firefox 128, along with many new features to make your enterprise deployments easier and even more flexible.\n\n\n\n\n\n\n\n\n - [Previous Firefox 128.0esr](/en-US/firefox/128.0esr/releasenotes/)\n - [Next Firefox 153.0esr](/en-US/firefox/153.0esr/releasenotes/)\n\n\n\n\n\n\n\n\n\n\n\n### Fixed\n\n\n\n\n\n\n -\n\n\n\nVarious [security fixes](https://www.mozilla.org/security/advisories/mfsa2026-84/).\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n### Developer\n\n\n\n\n\n\n -\n\n [Developer Information](https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/140)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n - [Previous Firefox 128.0esr](/en-US/firefox/128.0esr/releasenotes/)\n - [Next Firefox 153.0esr](/en-US/firefox/153.0esr/releasenotes/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Get the most recent version\n\n\n\n\n\n\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\nYour system may not meet the requirements for Firefox, but you can try one of these versions:\n\n\n\n\n\n Download Firefox — English (US)\n\n\n - [Windows 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 64-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Windows 32-bit MSI ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [macOS ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 64-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux ARM64/AArch64 ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n- [Linux 32-bit ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-windows-7-8-and-81-moving-extended-support) on Windows 8.1 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n\n\n [Download Firefox ESR 64-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n [Download Firefox ESR 32-bit](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n [Download a different build](/en-US/download/all/desktop-esr/)\n\n\n\n\n\n\n\n**Firefox is [no longer supported](https://support.mozilla.org/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support) on macOS 10.14 and below.**\n\n\n\nPlease download Firefox ESR (Extended Support Release) to use Firefox.\n\n\n\n [Download Firefox ESR](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n\n\n\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download Firefox ESR ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download for Linux 64-bit ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download for Linux ARM64 ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n - [** Download for Linux 32-bit ** ](https://download.mozilla.org/?product=%5BREDACTED%5D&os=%5BREDACTED%5D&lang=%5BREDACTED%5D)\n\n [Firefox Privacy Notice](https://www.mozilla.org/en-US/privacy/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_content=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Need help or want to leave feedback?\n\n [File a bug](https://bugzilla.mozilla.org/enter_bug.cgi) [Leave feedback](https://connect.mozilla.org/)\n\n\n\n\n\n## Get Involved\n\n\n\nDid you know that most of the content in Firefox Support was written by volunteers?\n\n [Find out more](https://support.mozilla.org/get-involved)\n\n\n\n\n\n## Other Resources\n\n [Developer Information](https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/140) [Complete list of changes for this release](https://bugzilla.mozilla.org/buglist.cgi?j_top=%5BREDACTED%5D&f1=%5BREDACTED%5D&o3=%5BREDACTED%5D&v3=%5BREDACTED%5D&o1=%5BREDACTED%5D&resolution=%5BREDACTED%5D&o2=%5BREDACTED%5D&query_format=%5BREDACTED%5D&f3=%5BREDACTED%5D&f2=%5BREDACTED%5D&bug_status=%5BREDACTED%5D&bug_status=%5BREDACTED%5D&bug_status=%5BREDACTED%5D&v1=%5BREDACTED%5D&v2=%5BREDACTED%5D&limit=%5BREDACTED%5D) [Press Kit](https://blog.mozilla.org/press/kits/) [Mozilla and Firefox News](https://blog.mozilla.org) [Firefox Extended Support Release](/en-US/browsers/enterprise/) [All Firefox for Desktop Releases](/en-US/releases/) [Learn more about Firefox](/en-US/more/)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Download\n\n\n - [Download Firefox](/thanks/)\n - [Windows](/en-US/download/windows/)\n - [macOS](/en-US/download/mac/)\n - [iOS](/en-US/download/ios/)\n - [Android](/en-US/download/android/)\n - [Linux](/en-US/download/linux/)\n - [Custom Download Options](/en-US/download/all/)\n\n\n\n\n\n\n\n\n\n## Latest Builds\n\n\n - [Nightly](/en-US/channel/desktop/#nightly)\n - [Beta](/en-US/channel/desktop/#beta)\n\n\n\n\n\n\n\n## Firefox for Business\n\n\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n\n\n\n\n\n\n\n## Community\n\n\n - [Connect](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Contribute](https://www.mozilla.org/contribute/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Developer](/en-US/channel/desktop/developer/)\n\n\n\n\n\n\n\n## Resources\n\n\n - [Compare](/en-US/compare/)\n - [Release Notes](/en-US/firefox/notes/)\n - [Learn](/en-US/more/)\n - [Merch store](https://shop.mozilla.com/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Add-ons](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Community](https://community.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n## Follow Us\n\n\n - [Instagram](https://www.instagram.com/firefox/)\n - [YouTube](https://www.youtube.com/user/firefoxchannel)\n - [TikTok](https://www.tiktok.com/@firefox)\n - [Bluesky](https://bsky.app/profile/firefox.com)\n - [Podcast](https://www.youtube.com/@firefox/podcasts)\n\n\n\n\n\n [Language](/locales/) Language\n\n English (Canadian) English (British) English\n\n Go\n\n\n\n### [Powered by Mozilla](https://www.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n [Ask us a question!](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Download\n\n\n - [Download Firefox](/thanks/)\n - [Windows](/en-US/download/windows/)\n - [macOS](/en-US/download/mac/)\n - [iOS](/en-US/download/ios/)\n - [Android](/en-US/download/android/)\n - [Linux](/en-US/download/linux/)\n - [Custom Download Options](/en-US/download/all/)\n\n\n\n\n\n\n\n## Resources\n\n\n - [Compare](/en-US/compare/)\n - [Release Notes](/en-US/firefox/notes/)\n - [Learn](/en-US/more/)\n - [Merch store](https://shop.mozilla.com/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Support](https://support.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Add-ons](https://addons.mozilla.org/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Community](https://community.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Blog](https://blog.mozilla.org/en/category/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n\n## Latest Builds\n\n\n - [Nightly](/en-US/channel/desktop/#nightly)\n - [Beta](/en-US/channel/desktop/#beta)\n\n\n\n\n\n\n\n## Firefox for Business\n\n\n - [Enterprise](/en-US/browsers/enterprise/)\n\n\n\n\n\n\n\n\n\n## Community\n\n\n - [Connect](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Contribute](https://www.mozilla.org/contribute/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Developer](/en-US/channel/desktop/developer/)\n\n\n\n\n\n\n\n## Follow Us\n\n\n - [Instagram](https://www.instagram.com/firefox/)\n - [YouTube](https://www.youtube.com/user/firefoxchannel)\n - [TikTok](https://www.tiktok.com/@firefox)\n - [Bluesky](https://bsky.app/profile/firefox.com)\n - [Podcast](https://www.youtube.com/@firefox/podcasts)\n\n\n\n\n\n\n\n [Language](/locales/) Language\n\n English (Canadian) English (British) English\n\n Go\n\n\n\n### [Powered by Mozilla](https://www.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n [Ask us a question!](https://connect.mozilla.org/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n\n - [Website Privacy Notice](https://www.mozilla.org/en-US/privacy/websites/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Terms of Use](https://www.mozilla.org/about/legal/terms/firefox/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Cookie Policy](/en-US/privacy/websites/cookie-settings/)\n - [Community Participation Guidelines](https://www.mozilla.org/en-US/about/governance/policies/participation/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n - [Logo Trademark Licensing](https://www.mozilla.org/foundation/trademarks/policy/?utm_source=%5BREDACTED%5D&utm_medium=%5BREDACTED%5D&utm_campaign=%5BREDACTED%5D)\n\n\n\n\n\n\n\n\n\n\n\n## Help us improve your firefox.com experience\n\n\n\n\n\nIn addition to Cookies necessary for this site to function, we’d like your permission to set some additional Cookies to better understand your browsing needs and improve your experience. Rest assured — we value your privacy.\n\n\n\n Accept All Additional Cookies Reject All Additional Cookies\n\n\n\n[Cookie settings](/en-US/privacy/websites/cookie-settings/)",
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"title": "Firefox ESR 140.15.0, See All New Features, Updates and Fixes",
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"message": "Current channels on [Mozilla's release list](https://www.mozilla.org/en-US/firefox/releases/), all shipped in the past 14 days:\n\n| Release | Version | Date |\n|---|---|---|\n| Desktop | [155.0.1](https://www.mozilla.org/en-US/firefox/155.0.1/releasenotes/) (after [155.0](https://www.mozilla.org/en-US/firefox/155.0/releasenotes/) on Sep 1) | Sep 4, 2026 |\n| ESR (new) | [153.2.0 ESR](https://www.mozilla.org/en-US/firefox/153.2.0/releasenotes/) | Sep 1, 2026 |\n| ESR (legacy) | [140.15.0 ESR](https://www.mozilla.org/en-US/firefox/140.15.0/releasenotes/) | Sep 1, 2026 |\n\nSecurity: each line carries its own advisory bundle, [MFSA 2026-82](https://www.mozilla.org/security/advisories/mfsa2026-82/) for 155, [MFSA 2026-85](https://www.mozilla.org/security/advisories/mfsa2026-85/) for 153.2.0 ESR, [MFSA 2026-84](https://www.mozilla.org/security/advisories/mfsa2026-84/) for 140.15.0 ESR. The ESR updates are security-only.\n\nCompatibility changes worth flagging in 155:\n- Captive portal checks moved from detectportal.firefox.com to firefox-portal-detection.com, so network allowlists need updating.\n- CSS is now capped at 75 levels of nested blocks and functions; deeper rules no longer parse.\n- mailto: links only open on explicit user action.\n- `::-webkit-scrollbar` support is now limited to a small site list instead of applying everywhere.\n- QUIC v2 for HTTP/3 is on; 155.0 had sites failing on UDP-blocking networks, fixed in 155.0.1 (workaround was `network.http.happy_eyeballs_enabled=false`).\n- 155.0.1 also fixes the vertical-tabs sidebar not persisting across restarts. Still open: SDR video can look washed out on macOS."
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"result": "Delivered (confirmed) as 3 messages. Your draft was polished into texting register, so the wording differs from what you wrote; this is exactly what the user sees:\n1) Current channels from the past 14 days: desktop at 155.0.1, ESR at 153.2.0 (new) and 140.15.0 (legacy), all Sept 1–4.\n2) ### Firefox current releases · Release schedule\n\n| Release | Version | Date | Security |\n|---|---|---|---|\n| Desktop | 155.0.1 | Sep 4, 2026 | [MFSA 2026-82](https://www.mozilla.org/security/advisories/mfsa2026-82/) |\n| ESR (new) | 153.2.0 ESR | Sep 1, 2026 | [MFSA 2026-85](https://www.mozilla.org/security/advisories/mfsa2026-85/) |\n| ESR (legacy) | 140.15.0 ESR | Sep 1, 2026 | [MFSA 2026-84](https://www.mozilla.org/security/advisories/mfsa2026-84/) |\n3) In 155: captive portal domain changed (update your allowlists), CSS nesting capped at 75 levels, mailto: links need explicit user action, webkit-scrollbar limited to a small site list, and QUIC v2 for HTTP/3 is live (155.0.1 fixes the UDP-blocking issue from 155.0). Vertical-tabs sidebar persistence also fixed in 155.0.1; SDR video still looks washed out on macOS.\nThese are your words now, and this is the whole reply: the delivery layer chose its density and shape by design. Never dispute, re-explain, or apologize for the phrasing, and never send a supplement to restore detail it left out. Only a final send settles its request. Never chase wording with another send. If a fact in it is wrong and would change what the user does, correct it when their next message arrives.\n\nNothing else is open: no request awaits a reply and no work is running. A response with no tool call ends the run.\nanswers: 06e9b5c7-9237-4fad-aeb3-b7a5cc990ce8",
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}| Release | Version | Date | Security |
|---|---|---|---|
| Desktop | 155.0.1 | Sep 4, 2026 | MFSA 2026-82 |
| ESR (new) | 153.2.0 ESR | Sep 1, 2026 | MFSA 2026-85 |
| ESR (legacy) | 140.15.0 ESR | Sep 1, 2026 | MFSA 2026-84 |
### Firefox current releases · Release schedule | Release | Version | Date | Security | |---|---|---|---| | Desktop | 155.0.1 | Sep 4, 2026 | [MFSA 2026-82](https://www.mozilla.org/security/advisories/mfsa2026-82/) | | ESR (new) | 153.2.0 ESR | Sep 1, 2026 | [MFSA 2026-85](https://www.mozilla.org/security/advisories/mfsa2026-85/) | | ESR (legacy) | 140.15.0 ESR | Sep 1, 2026 | [MFSA 2026-84](https://www.mozilla.org/security/advisories/mfsa2026-84/) |