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Firefox 126 release information


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:

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

What's new in Firefox 126

Firefox Desktop

Guidance notification on how to set Firefox as a default browser (Windows only)
Description: Users are no longer able to set Firefox as the default browser with one click – Windows is forcing users to navigate to the Windows Setting. In response, we are planning to land a "Guidance notification" in Fx126 to help educate users in the process and on the notifications there is a "show me how" that will lead to a SUMO page to explain.
Content request:
KB article: KB updated

Firefox for Android

String changes - add-ons > extensions
Description: All “add-ons” copy will be changed to “extensions” moving forward.
Content request:
KB articles: KB updated
Full Page translations
Description: Firefox Translations is the in-browser Translation features that allow Firefox users translate full webpage content in 16 languages
Content request:
KB article: New KB
Add `Passwords` item to the three-dot menu
Description: The three-dot menu has a new item: Passwords, placed between Downloads and Extensions
Content request:
KB articles: KB updated

Firefox for iOS

No content updates for v126

Known studies/experiments

Platform Studies/experiments Description
iOS App Customization in iOS Adding lightmode/darkmode and the option to choose your toolbar location during onboarding in the hopes to drive Daily Active Users. This is rolling out to 50% of all users.
iOS Splash screen Experiment Splashscreen has an animation and it will be displayed for an X amount of minutes in order to allow app to load experiments. This is only shown on very first launch of app. For accessibility, we will show the animation in slow motion. This is also rolling out to 50% of all users. Please keep an eye out of users reporting about app slowness.

Release notes

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 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’ed 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.



Dot releases

Platform Version Release date Notable fixes
Desktop/Android/iOS - - -

Trending issue(s)

Platform Issue Known bug Fix/workaround
Desktop/Android/iOS - - -

Known incident(s)

Twitter/X is broken with ETP strict mode
Severity level: S2
Status: Resolved per May 17, 2024. 15:00 (GMT+2)
Associated bug:
Resolution/workaround: Support update:


  • Release report (TBD)