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:
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 & Focus for Android |
143.0.2 |
September 23, 2025 |
Crash fixes |
-
|
| Firefox ESR |
140.3.1 |
September 23, 2025 |
Improved reliability when HTTP/3 connections fail bug1980812 |
-
|
| Firefox for iOS |
143.1 |
September 29, 2025 |
Various fixes |
-
|
| Firefox Desktop |
143.0.3 |
September 30, 2025 |
Multiple bug fixes |
-
|
| Firefox & Focus for Android |
143.0.3 |
September 30, 2025 |
Multiple bug fixes and security fix |
-
|
| Firefox Desktop |
143.0.4 |
October 3, 2025 |
Fixed bug1990699 |
-
|
| Firefox & Focus for Android |
143.0.4 |
October 3, 2025 |
Multiple bug fixes |
-
|
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!
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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
| 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
|
Firefox for Android content update
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 |
Extension Support on IOS |
[24] |
Tracking
|
| iOS |
Default page zoom setting |
[25] |
In progress
|
| iOS |
Translate feature in Firefox for iOS |
[26] |
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 |
Fixed in v144
|
| Desktop |
Webcompat |
OneDrive Moments do not load |
bug 1987565 |
Fixed in v144
|
| Desktop |
Crashes |
magicdsfilterQuest3.dll causes Firefox to crash |
bug 1986922 |
Fixed in v143.0.3
|
| Desktop |
Webcompat |
Facebook audio and video call isn't working in Firefox |
bug 1896361 |
-
|
| Android |
UI/UX |
Firefox renders a place for a keyboard when the keyboard is hidden |
bug 1987065 |
Fixed in v143.0.3
|
| Android |
UI/UX |
Deleted history pages reappear upon Firefox restart |
bug1990978 |
Fixed in v143.0.4
|
| Android |
UI/UX |
Opening links to external applications in a new tab did not trigger the "Open in app" prompt |
bug 1980753 |
Fixed in v143.0.4
|
| iOS |
UI/UX |
Send tab functionality is missing |
[27] |
Unknown
|
| 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
|
| iOS |
UI/UX |
Display issue on iPad after iOS 26 Update |
- |
This will be fixed in 143.2
|
| iOS |
UI/UX |
Google search shows a download app message |
[28] |
Unknown
|
| 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.
|
| Google workspace performed slow in Firefox
|
| Description:
|
Sporadic slow/failed loads on some Google sites on systems with certain third-party software installed.
|
| Status:
|
Resolved
|
| Product(s) impacted:
|
Firefox Desktop
|
| Associated bug:
|
https://bugzilla.mozilla.org/show_bug.cgi?id=1990699
|
| Resolution/workaround:
|
Resolved in v143.0.4
|
| 143.1 crashes on new tab open and launch
|
| Description:
|
App Crashing on startup when loading duplicated Bookmarks from sync
|
| Status:
|
Ongoing
|
| Product(s) impacted:
|
Firefox for iOS
|
| Associated bug:
|
https://github.com/mozilla-mobile/firefox-ios/issues/29701
|
| Resolution/workaround:
|
Should be fixed v143.1.1
|
| YouTube videos not loading videos on Firefox v143.0.3 for Android
|
| Description:
|
YouTube web version mobile/desktop not loading videos on Firefox v143.0.3 for Android
|
| Status:
|
Ongoing
|
| Product(s) impacted:
|
Firefox for Android
|
| Associated bug:
|
https://bugzilla.mozilla.org/show_bug.cgi?id=1992172
|
| Resolution/workaround:
|
TBD
|
Post-release
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