close
Firefox
Menu

Firefox Beta and Developer Edition
Release Notes

Release Notes tell you what's new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release.

157.0beta Firefox Beta

September 14, 2026

Version 157.0beta, first offered to Beta channel users on September 14, 2026

Firefox Beta gets updated 3 times a week and as a consequence, the release notes for the Beta channel are updated continuously to reflect features that have reached sufficient maturity to benefit from community feedback and bug reports.

Warning: Features listed here may or may not make a final release of Firefox

In addition to these release notes, you can follow ongoing development via the Firefox Trains website or our @FirefoxBeta Bluesky account.

New

  • Tapping the search field on the Firefox for Android homepage now shows your recent searches

Fixed

  • HDR videos encoded as 8bit color formats now properly display as HDR in most cases, this fixes several cases of dull gray looking videos that should have been more vibrant.

  • Improved audio/video synchronization when changing playback rate on HTMLMediaElement.

  • Fixed the Vertical Tabs sidebar not reappearing when the cursor moves to the edge of the screen in full screen mode.

Developer

Web Platform

  • Firefox now supports the at-rule() function for @supports. This allows authors to detect for browser support of specific at-rules, such as @supports at-rule(@scope).

  • Firefox now supports the chain value for the CSS overscroll-behavior property.

Get the most recent version

Need help or want to leave feedback?

File a bug Leave feedback

Get Involved

Did you know that most of the content in Firefox Support was written by volunteers?

Find out more

Other Resources

Developer Information Complete list of changes for this release Press Kit Mozilla and Firefox News Firefox Extended Support Release All Firefox for Desktop Releases Learn more about Firefox