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.

143.0beta Firefox Beta

August 19, 2025

Version 143.0beta, first offered to Beta channel users on August 19, 2025

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

  • When a site asks for camera access, it can now be previewed in the permission dialog. This is especially helpful when switching between multiple cameras.

  • Tapping a persistent notification when Firefox for Android is closed or restarted now properly opens Firefox with the relevant webpage.

  • Firefox has expanded its Fingerprinting Protection by reporting constant values for several more attributes of user's computers. More Details

  • When downloading a file in private browsing mode, the user will be prompted to chose whether they want to keep or delete files that are downloaded while in private browsing. This preference can also be set at about:settings.

  • With Firefox for Android, you can now see your download progress in real time, with controls to pause, resume, retry, or cancel — all from the Downloads screen.

  • Firefox for Android users can now configure DNS over HTTPS in the settings UI.

Developer

  • Unchecking the Group Similar Messages setting now prevents successive similar messages from being grouped so that all messages are displayed in the output.

Web Platform

  • Firefox now supports xHE-AAC audio playback on Windows 11 22H2+, macOS, and Android 9+.

  • <input type=color> now recognizes the CSS <color> format in addition to the color hex format (#ffffff). This means that color names like black and more complex strings like rgb(200 200 200) are now valid inputs. For now the value will always be converted to the hex format.

  • Firefox now uses an updated grid sizing algorithm to better align with the CSS Grid specification. Grid layouts that use percentage row sizes or grid items containing elements with aspect ratios (such as images) will now render correctly in more cases.

  • Restrictions were removed that prevented setting the display property on <details> elements, and a ::details-content pseudo-element was added to style the expandable/collapsible contents of those elements.

All Firefox Beta downloads