Support/Firefox138

Firefox 138 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

Release notes

• Desktop 138.0 Release Notes
• ESR 115.23.0 Release Notes
• ESR 128.10.0 Release Notes
• Firefox for Enterprise 138 Release Notes
• Firefox for developers 138 Release Notes
• Firefox for Android 138.0 Release Notes
• Firefox for iOS 138.0 Release Notes

Bug & feedback boards

• Firefox bug board
• Firefox feedback board

Dot releases

Platform	Version	Release date	Notable fixes	Unresolved	Reddit forum
Firefox Desktop	138.0.1	May 1, 2025	bug1963537, bug1961710	-	[1]
Firefox & Focus for Android	138.0.2	May 6, 2025	Fixed a PiP bug (bug1956165 and various stability fixes	-
Firefox Desktop and Firefox/Focus/Klar for Android	138.0.3	May 13, 2025	bug1961191, bug1924241, bug1961610, bug1952611	-	[2]
Firefox Desktop and Firefox/Focus/Klar for Android	Firefox 138.0.4, ESR 115.23.1, ESR 128.10.1	May 17, 2025	Security fixes	-	[3]

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 a week before Firefox release date). Check our schedule here and don't hesitate to join the call in person if you can!
• Firefox pod meeting: If you’re an NDA’d contributor, you can watch the recording of our Firefox Pod Meeting from AirMozilla to catch up with the latest train release. You can also subscribe to the AirMozilla folder by clicking on the Subscribe button in the top-right corner of the page to get notifications each time we add a new recording.
• Newsletter: Consider subscribing to Firefox Daily Digest to get daily updates (Mon-Fri) about Firefox from across the internet.

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

What's new in Firefox 138

Firefox Desktop

Smart Tab Groups
Description:	How to use the smart tab grouping feature, which is an experimental feature in 138.
Content request:	https://bugzilla.mozilla.org/show_bug.cgi?id=1953899
KB article:	https://support.mozilla.org/kb/how-use-ai-enhanced-tab-groups	New article

Accuweather update
Description:	An update to the weather forecast article
Content request:	https://bugzilla.mozilla.org/show_bug.cgi?id=1963191
KB articles:	https://support.mozilla.org/kb/get-your-local-weather-forecast-firefox-address-bar	Article update

Firefox profile management (progressive roll out)
Description:	Firefox profile management
Content request:	https://bugzilla.mozilla.org/show_bug.cgi?id=1952062
KB articles:	https://support.mozilla.org/kb/profile-management	Article update

Firefox for Android

Download manager enhancement
Description:	Enhancement on the Android's download manager feature
Content request:	https://bugzilla.mozilla.org/show_bug.cgi?id=1961695
KB article:	https://support.mozilla.org/kb/downloads-firefox-android	Article update is in progress

Bookmarks enhancement
Description:	Enhancement on ability to sort bookmarks on Android
Content request:	https://bugzilla.mozilla.org/show_bug.cgi?id=1961693
KB article:	https://support.mozilla.org/kb/add-delete-and-view-bookmarked-webpages-firefox-android	Article update is in progress

Escalation

TBD

Known issue(s)/Trending topic(s)

Platform	Issue	Known bug/Related discussions	Fix/workaround
Desktop	Sidebar bookmarks no longer open automatically since the last update	Bug1963549	-
Desktop	Twitch stopped working on Firefox ESR 115	Bug1967582, Reddit thread	See [4]
Android	Unexpected client auth certificate request dialog on Android	Bug1966033	Fix will land on version 140
Android	Keyboard popping up automatically when user launch Firefox for Android	It's related to an experiment which should've been ended by now	No further action needed from the user. Should be back to normal automatically.
Android	Translation feature disparity for CJK languages	[5]	Users can access these languages on the Beta version while team is working on improving the models for Android
iOS	User is redirected to Google app after force-closing and reopening Firefox if a Google search is open	[6]	-

Known incident(s)

New tab page blank even when set to Firefox Home in 138.0
Description:	Some users experience an issue with the new tab is showing blank page despite settings being set to Firefox Home.
Status:	Solved
Product(s) impacted:	Firefox Desktop 138
Associated bug:	https://bugzilla.mozilla.org/show_bug.cgi?id=1963537
Resolution/workaround:	Update to 138.0.1

Youtube stops loading due to a syntax error on the latest version of firefox.
Description:	Users are seeing a blank page. Individual videos load if you have the URLs on hand, but nothing else on the page will load, and the videos will eventually time out.
Status:	Ongoing
Product(s) impacted:	Firefox Desktop 138
Associated bug:	https://bugzilla.mozilla.org/show_bug.cgi?id=1963511
Resolution/workaround:	See https://bugzilla.mozilla.org/show_bug.cgi?id=1963511#c32