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Firefox Nightly
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.

104.0a1 Firefox Nightly

June 27, 2022

Version 104.0a1, first offered to Nightly channel users on June 27, 2022

Firefox Nightly gets updated every day and as a consequence, the release notes for the Nightly 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 on our @FirefoxNightly Twitter account as well as read our Nightly Blog.


  • Subtitles are now available for Disney+ in Picture-in-Picture.

    Bug 1766273
  • The PDF viewer allows text writing, drawing and signature.

    Bug 1784272
  • Firefox now supports both the scroll-snap-stop property as well as re-snapping. You can use the scroll-snap-stop property's always and normal values to specify whether or not to pass the snap points, even when scrolling fast. Re-snapping tries to keep the last snap position after any content/layout changes.

    Bug 1530253
  • The Firefox profiler can analyze power usage of a website (Apple M1 and Windows 11 only).


    Bug 1774844
  • The Firefox UI itself will now be throttled for performance and battery usage when minimized or occluded, in the same way background tabs are.

    Bug 1779559


  • After bypassing the https only error page navigating back would take you to the error page that was previously dismissed. Back now takes you to the previous site that was visited.

    Bug 1762566

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All Firefox Nightly downloads