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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.

86.0beta Firefox Beta

January 26, 2021

Version 86.0beta, first offered to Beta channel users on January 26, 2021

Firefox Beta gets updated several times per 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.

In addition to these release notes, you can follow ongoing development on our @FirefoxBeta Twitter account.


  • Expanding credit card management and autofill capabilities to Canadian builds of Firefox

  • Enable multiple Picture-in-Picture support by default


  • Reader mode now works with local HTML pages.


  • From Firefox 86 on forward DTLS 1.0 is no longer supported for establishing WebRTC's PeerConnections. All WebRTC services need to support DTLS 1.2 from now on as the minimum version.

  • On Linux and Android, the protection to mitigate the stack clash attack has been activated.

Web Platform

  • Basic AVIF support is enabled in Firefox 86. Some advanced features like animated images and colorspace support are still in development (see bug 1443863 and dependencies)

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All Firefox Beta downloads