Support/Firefox143
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Firefox 140 release information
Disclaimer
The following information is intended for members of the Mozilla Support community for the purpose of supporting users in the Mozilla Support platform. Mozilla Support is a community of enthusiastic volunteers and employees trying to support Mozilla's users around the globe. You can join us by contributing through the following ways:
To learn more about how to stay updated with Firefox release information, trending, and known issues, please also check out How to stay updated with Firefox release
Release notes
- Desktop 143.0 Release Notes
- ESR 115.28.0 Release Notes
- ESR 143.3.0 Release Notes
- Firefox for Enterprise 143 Release Notes
- Firefox for developers 143 Release Notes
- Firefox for Android 143.0 Release Notes
- Firefox for iOS 143.0 Release Notes
Dot releases
| Platform | Version | Release date | Notable fixes | Unresolved |
|---|---|---|---|---|
| Firefox Desktop | 143.0.1 | September 19, 2025 | Fixed a tab crash experienced by some users caused by DLL injection bug1872261 | - |
| Firefox ESR | 140.3.1 | September 23, 2025 | Improved reliability when HTTP/3 connections fail bug1980812 | - |
Bug & feedback boards
Contributor discussions
Please refer to the following contributor forum threads to learn more about known issues and discuss with other contributors:
You can also join our Matrix channel to ask questions/join community discussion.
Stay updated
Apart from sharing release information, there are other ways to stay updated with product release and community updates:
- Community call: We run a monthly community call (usually on the same week we release a new Firefox version). Check our schedule here and don't hesitate to join the call in person if you can!
- Newsletter: Consider subscribing to Firefox Daily Digest to get daily updates (Mon-Fri) about Firefox from across the internet.
What's new in Firefox 143
Content in this page is being updated periodically as we're rolling out the release.
Firefox Desktop content update
| Local Network Access for Desktop | ||
|---|---|---|
| Description: | New articles for Local Device permission and Local Network permission | |
| Content request: | [1] and [2] | |
| KB article: | https://support.mozilla.org/kb/control-personal-device-local-network-permissions-firefox | New article |
| New Tab Widgets | ||
|---|---|---|
| Description: | New article for the New Tab Widgets | |
| Content request: | [3] | |
| KB article: | https://support.mozilla.org/en-US/kb/firefox-new-tab-widgets | New article |
| Web compatibility exceptions | ||
|---|---|---|
| Description: | Web compatibility exceptions | |
| Content request: | [4] | |
| KB article: | https://support.mozilla.org/kb/manage-enhanced-tracking-protection-exceptions | New article |
| Link Previews for Windows and MacOS | ||
|---|---|---|
| Description: | Link Previews for Windows and MacOS | |
| Content request: | [5] and [6] | |
| KB articles: | TBD | New article |
| TBD | New article | |
| Taskbar Tabs (win only) | ||
|---|---|---|
| Description: | New article for the Taskbar Tabs feature | |
| Content request: | [7] | |
| KB article: | TBD | New article |
| Stock market suggestions | ||
|---|---|---|
| Description: | Update the Suggest articles with Stock market suggestions | |
| Content request: | https://bugzilla.mozilla.org/show_bug.cgi?id=1986546 | |
| KB article: | https://support.mozilla.org/en-US/kb/firefox-suggest https://support.mozilla.org/en-US/kb/firefox-suggest-faq |
Article update |
| Update the AI Chatbot SUMO | ||
|---|---|---|
| Description: | Add Copilot in the AI Chatbot offering | |
| Content request: | https://bugzilla.mozilla.org/show_bug.cgi?id=1986747 | |
| KB article: | https://support.mozilla.org/kb/ai-chatbot | New article/Article update |
| Manage Enhanced Tracking Protection exceptions | ||
|---|---|---|
| Description: | Manage Enhanced Tracking Protection exceptions | |
| Content request: | https://bugzilla.mozilla.org/show_bug.cgi?id=1987112 | |
| KB article: | https://support.mozilla.org/kb/manage-enhanced-tracking-protection-exceptions | Article update |
Firefox for Android content update
| Local Network Access for Android | ||
|---|---|---|
| Description: | New articles for Local Device permission and Local Network permission | |
| Content request: | [8] and [9] | |
| KB article: | https://support.mozilla.org/kb/manage-notifications-firefox-android | New article |
Firefox for iOS content update
No content for iOS in this version
Known studies/experiments
Trending requests
| Platform | Request | Related discussions | Status |
|---|---|---|---|
| Desktop | Split-screen/Tab-in-Tab feature | [10] | In development |
| Desktop | Synced tab groups | [11] | Tracking |
| Desktop | Customizable bookmark toolbar font | [12] | Tracking |
| Desktop | Customizable hotkeys | [13] | Tracking |
| Desktop | Differentiate "Site you save" and "Sites you visit" in new tab | [14] [15] | Tracking |
| Desktop | Add an option to disable this new "Drag to Pin/Unpin Tab" feature | [16] | Tracking |
| Mobile | Support Casting | [17] | Tracking |
| Android | Mobile tab grouping | [18] | Tracking |
| Android | Android address bar is too cluttered | [19] [20] [21] [22] [23] | Tracking |
| Android | Add a setting to enable tab strip | ConnectBugzilla | Tracking |
| iOS | Default page zoom setting | [24] | In progress |
| iOS | Translate feature in Firefox for iOS | [25] | Tracking |
For other top requests on Mozilla Connect, please check out this Connect thread
Known issues
| Platform | Category | Issue | Known bug/Related discussions | Fix/workaround |
|---|---|---|---|---|
| Desktop | Webcompat | Audible doesn't work in 143 | bug 1989946 | In progress |
| Desktop | Webcompat | OneDrive Moments do not load | bug 1987565 | Fixed in v145 |
| Desktop | Crashes | magicdsfilterQuest3.dll causes Firefox to crash | bug 1986922 | Fixed in v145 |
| Desktop | Webcompat | Facebook audio and video call isn't working in Firefox | bug1896361 | - |
| Android | UI/UX | Deleted history pages reappear upon Firefox restart | bug1990978 | In progress |
| Android | UI/UX | Firefox for Android no longer restart in private browsing mode | bug1973769 | This is intentional as per [26] |
| iOS | UI/UX | Reader mode is replaced with Summarize icon | - | Touch and hold the Thunderbolt icon to enter Reader Mode (we'll also update the Reader Mode article for iOS |
| iOS | UI/UX | Tabs and Settings menu are swapped after recent iOS UI redesign | Connect thread | This is intentional |
| Nightly 144 | UI/UX | Drag tab to pin functionality is too sensitive | Reddit thread, Discourse post | - |
Known incidents
| iClouds logins broken sometimes | |
|---|---|
| Description: | Users who previously logged in to iCloud from Firefox are now unable to do so because of an incorrect stale cookie. |
| Status: | Resolved |
| Product(s) impacted: | Firefox Desktop [/Android/iOS?] |
| Associated bug: | https://bugzilla.mozilla.org/show_bug.cgi?id=1987563 |
| Resolution/workaround: | The workaround was clearing cookies and site data. The issue should now be resolved as Apple has reverted the change causing it. |