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:

• Answer questions in the support forum
• Write help articles
• Localize support content

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	-

Bug & feedback boards

• Firefox bug board
• Firefox feedback board

Contributor discussions

Please refer to the following contributor forum threads to learn more about known issues and discuss with other contributors:

• Desktop release discussion
• Mobile release discussion
• Localization discussion

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

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	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.