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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.

119.0beta Firefox Beta

September 26, 2023

Version 119.0beta, first offered to Beta channel users on September 26, 2023

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 our @FirefoxBeta Twitter account.


  • Firefox View now includes more content:

    • You can now see all open tabs from all windows.
    • If you sync open tabs then you will now see all tabs from other devices.
    • Browsing history is now listed and you can sort by date or by site.
    • As before, recently closed tabs are also listed in Firefox View.
  • If the relevant Windows mouse properties system setting is enabled, the mouse pointer will disappear while typing.

  • Firefox is now available in the Santali (sat) language.

  • If you're migrating your data from Chrome, Firefox now offers the ability to import some of your extensions as well.

  • Media sniffing is now disabled for top-level documents served as type application/octet-stream. Allowing these files to be downloaded instead of attempting playback.

  • The visibility of fonts to websites has been restricted to system fonts and language pack fonts in ETP strict mode to mitigate font fingerprinting.

  • As part of total cookie protection, Firefox now supports the partitioning of Blob URLs, this mitigates a potential tracking vector that third party agents could have used to track an individual.

  • Recently closed tabs now persist between sessions that don't have automatic session restore enabled. Manually restoring a previous session will continue to reopen any previously open tabs or windows.

  • Firefox now supports editing PDFs by adding images, in addition to adding text and drawing. The ability to add Alt Text is also supported while adding images to a PDF document.

  • Encrypted Client Hello (ECH) is now available to Firefox users, delivering a more private browsing experience. ECH extends the encryption used in TLS connections to cover more of the handshake and better protect sensitive fields.
    Read more about the launch of ECH on Mozilla Distilled.


  • Fixed an issue causing unexpected jumps in scroll position on Facebook.

Web Platform

  • ARIA reflection for simple attributes and default Accessibility Semantics for Custom Elements are now supported. Note that this includes boolean, enum, number, and string attributes, but not attributes that reference other elements.

  • credentialless is now supported in Cross-Origin-Embedder-Policy.

  • Grouping of items in an array (and iterables) is now easier by using the methods Object.groupBy() or Map.groupBy().

  • The CSS attr() function now supports a fallback parameter (e.g. attr(foobar, "Default value")).

Get the most recent version

All Firefox Beta downloads