Support/Firefox140

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
• Provide support on social media channels
• Respond to mobile store reviews

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 140.0 Release Notes - r/firefox thread
• ESR 115.25.0 Release Notes
• ESR 128.12.0 Release Notes
• ESR 140.0 Release Notes
• Firefox for Enterprise 140 Release Notes
• Firefox for developers 140 Release Notes
• Firefox for Android 140.0 Release Notes
• Firefox for iOS 140.0 Release Notes

Dot releases

Platform	Version	Release date	Notable fixes	Unresolved
Firefox Desktop	140.0.1	June 26, 2025	bug1971487, bug1973947	bug1968040
Firefox & Focus for iOS	140.1	June 26, 2025	Various stability fixes	-
Firefox Desktop	140.0.2	June 28, 2025	bug1974259
Firefox & Focus for Android	140.0.3	July 1, 2025	bug1956165, bug1974569	-
Firefox Desktop	140.0.4	July 8, 2025	bug1971053, bug1971094
Firefox & Focus for Android	140.0.4	July 8, 2025	Various stability fixes	-

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 140

Content in this page is being updated periodically as we're rolling out the release.

Firefox Desktop content update

Updates for extensions menu in toolbar (win only)
Description:	Users can now hide the extensions menu in the toolbar.
Content request:	[1]
KB articles:	https://support.mozilla.org/kb/extensions-button	Articles update
	https://support.mozilla.org/kb/how-stop-firefox-making-automatic-connections
	https://support.mozilla.org/kb/unable-install-add-ons-extensions-or-themes
	https://support.mozilla.org/kb/use-themes-change-look-of-firefox
	https://support.mozilla.org/kb/troubleshoot-extensions-themes-to-fix-problems
	https://support.mozilla.org/kb/disable-or-remove-add-ons
	https://support.mozilla.org/kb/reporting-extensions-and-themes-abuse
	https://support.mozilla.org/en-US/kb/re-enable-add-ons-disabled-when-updating
	https://support.mozilla.org/en-US/kb/built-themes-firefox-alternative-complete-themes
	https://support.mozilla.org/en-US/kb/how-update-add-ons
	https://support.mozilla.org/en-US/kb/if-another-extension-interferes-mozilla-vpn
	https://support.mozilla.org/en-US/kb/review-installed-extensions
	https://support.mozilla.org/en-US/kb/extensions-private-browsing
	https://support.mozilla.org/en-US/kb/find-and-install-add-ons-add-features-to-firefox
	https://support.mozilla.org/en-US/kb/manage-extension-shortcuts-firefox
	https://support.mozilla.org/en-US/kb/personalized-extension-recommendations
	https://support.mozilla.org/en-US/kb/extension-changed-my-new-tab-page
	https://support.mozilla.org/en-US/kb/manage-optional-permissions-extensions
	https://support.mozilla.org/en-US/kb/add-ons-cause-issues-are-on-blocklist
	https://support.mozilla.org/en-US/kb/troubleshoot-issues-related-to-add-ons
	https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox
	https://support.mozilla.org/en-US/kb/access-your-add-ons-firefox-accounts
	https://support.mozilla.org/en-US/kb/extensions-private-browsing
	https://support.mozilla.org/en-US/kb/add-on-badges
	https://support.mozilla.org/en-US/kb/quarantined-domains
	https://support.mozilla.org/en-US/kb/cannot-remove-add-on-extension-or-theme
	https://support.mozilla.org/en-US/kb/remove-toolbar-has-taken-over-your-firefox-search
	https://support.mozilla.org/en-US/kb/get-started-firefox-overview-main-features
	https://support.mozilla.org/en-US/kb/recommended-extensions-program
	https://support.mozilla.org/en-US/kb/facebook-container-isnt-working
	https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
	https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings
	https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can
	https://support.mozilla.org/en-US/kb/facebook-container-prevent-facebook-tracking
	https://support.mozilla.org/en-US/kb/what-search-hijacking
	https://support.mozilla.org/en-US/kb/firefox-advanced-customization-and-configuration
	https://support.mozilla.org/en-US/kb/how-do-i-choose-what-information-sync-firefox
	https://support.mozilla.org/en-US/kb/access-mozilla-services-firefox-account
	https://support.mozilla.org/en-US/kb/change-your-default-search-settings-firefox
	https://support.mozilla.org/en-US/kb/warning-unresponsive-script
	https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
	https://support.mozilla.org/en-US/kb/use-troubleshooting-information-page-fix-firefox
	https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox

Adding Custom Search Engines
Description:	New way to add custom search engines to Firefox desktop
Content request:	[2]
KB article:	https://support.mozilla.org/kb/add-custom-search-engine-firefox	New article

How to unload tab
Description:	New feature in v140 to unload tab(s) to reduce Firefox's memory usage
Content request:	[3]
KB article:	https://support.mozilla.org/kb/unload-tabs-reduce-memory-usage-firefox/	New article

Update to address autofill article - Australia and India rollout
Description:	As title
Content request:	[4]
KB article:	https://support.mozilla.org/kb/automatically-fill-your-address-web-forms	Article update

Address autofill article - Italy, Poland and Austria rollout
Description:	As title
Content request:	[5]
KB article:	https://support.mozilla.org/kb/automatically-fill-your-address-web-forms	Article update

Chrome Import Changes on Windows -- Passwords via CSV, Payment methods disabled
Description:	Feature description
Content request:	[6]
KB articles:	https://support.mozilla.org/kb/import-bookmarks-google-chrome	Article update
	https://support.mozilla.org/kb/import-data-another-browser	Article update

On-device Model Management
Description:	We'd like to empowers users to control AI on their devices with a transparent, user-first local model management system through this feature
Content request:	[7]
KB article:	https://support.mozilla.org/kb/on-device-models	New article

Firefox for Android content update

Firefox Android Biometric Authentication in Private Browsing Mode
Description:	introducing biometric authentication—face, fingerprint, or PIN unlock—for private browsing mode (PBM)
Content request:	[8]
KB article:	https://support.mozilla.org/kb/screen-lock-private-browsing-firefox-android	New article

Bookmark management "Select all" functionality
Description:	Added the ability to "select all" in the bookmarks screen
Content request:	[9]
KB articles:	https://support.mozilla.org/kb/manage-bookmark-folders-firefox-android	Article update
	https://support.mozilla.org/en-US/kb/add-delete-and-view-bookmarked-webpages-firefox-android	Article update

Firefox for iOS content update

Address bar location on iOS
Description:	We updated the setting that used to be called "Toolbar". Now the setting is called "Address Bar".
Content request:	[10]
KB article:	https://support.mozilla.org/kb/how-move-search-bar-firefox-ios	Article update

Known studies/experiments

Platform	Studies/experiments	Description	Related discussions	Forum tag
Firefox for Android	Android tablet address bar moved on top of the screen	-	[11]	browser-appearance
Firefox for Android	Search box in the middle of home screen		-	browser-appearance
Firefox for Android	Remove all content (including Jump Back In, Bookmarks, Recently Visited) from home screen except Shortcuts and Stories	-	-	browser-appearance

Trending requests

Platform	Request	Related discussions	Status
Desktop	Synced tab groups	[12]	Tracking
Desktop	Customizable bookmark toolbar font	[13]	Tracking
Desktop	Customizable hotkeys	[14]	Tracking
Desktop	Differentiate "Site you save" and "Sites you visit" in new tab	[15] [16]	Tracking
Android	Android address bar is too cluttered	[17] [18] [19] [20] [21]	Tracking
Android	Add a setting to enable tab strip	ConnectBugzilla	Tracking
iOS	Default page zoom setting	[22]	In progress
iOS	Translate feature in Firefox for iOS	[23]	Tracking

For other top requests on Mozilla Connect, please check out [24]

Known issues

Platform	Category	Issue	Known bug/Related discussions	Fix/workaround
Desktop	Crashes	Startup crashes caused by MS's Family Safety feature	[25]	turn off the Family Safety feature temporarily
Desktop	Webcompat	NYT tells me I am a bot and will not let me read articles	#162420	Create a new profile? (to be confirmed)
Desktop	Webcompat	Facebook audio and video call isn't working in Firefox	bug1896361	-
Desktop	UI/UX	In vertical mode, when the tab strip is not in a <toolbar>, SVG favicons using prefers-color-scheme don't always get the correct color-scheme according to theme colors.	bug1968040	A fix is coming in v141
Desktop	Media	Taskbar Appearing when playing Full Screen Videos	bug1965699	A fix is coming in v141
Desktop	UI/UX	Switching search engines on a new address bar	[26] [27]	Use keyword shortcut (e.g. @google, @ddg) on the new address bar
Android	UI/UX	Back button jumps to first entry in tab's history rather than previous entry	bug1958609	Fixed in v139
Android	UI/UX	Don't show the empty state while bookmarks are loading	bug1957713	Fixed in v140
Android	Security	Unexpected client auth certificate request dialogs	bug1966033	Fixed in v140
Android	UI/UX	spacebar and backspace working abnormaly in google search bar with gboard	bug1968872	-
iOS	OS/API	User is redirected to Google app after force-closing and reopening Firefox if a Google search is open	https://github.com/mozilla-mobile/firefox-ios/issues/26361	Remediation added in v139.1 and v140.0b1 (waiting for feedback)

Known incidents

Sidebar dark theme issue
Description:	Sidebar text has changed from white to black for some themes resulting in low contrast with dark background
Status:	Resolved
Product(s) impacted:	Firefox Desktop
Associated bug:	[28]
Resolution/workaround:	Fixed in 140.0.1

Startup crashes in Fx140 caused by DLL
Description:	Crash in [@ ff64.dll SetThreadInformation]
Status:	Resolved
Product(s) impacted:	Firefox Desktop
Associated bug:	https://bugzilla.mozilla.org/show_bug.cgi?id=1973947
Resolution/workaround:	Fixed in 140.0.1

Deep links stopped working on Android 140.0
Description:	Firefox for Android users on version 140 were unable to leverage protocol URIs.
Status:	Resolved with the 140.0.3 release
Product(s) impacted:	Firefox for Android
Associated bug:	https://bugzilla.mozilla.org/show_bug.cgi?id=1974569
Resolution/workaround:	Update to version 140.0.3 should fix this issue