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See what landed recently in Firefox Nightly!

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.

135.0a1 Firefox Nightly

November 25, 2024

Version 135.0a1, first offered to Nightly channel users on November 25, 2024

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 X account as well as read our Nightly Blog.

You can interact with other Firefox Nightly users and give your feedback to Mozilla staff in the Nightly Matrix room on chat.mozilla.org.

Changed

  • Starting with Firefox for Android 131, HLS playlist support was deprecated in Nightly builds. Extended testing showed no adverse impact as newer playback technologies have been widely adopted by websites.

    Bug 1911651

Developer

  • Developer Information

  • Starting with Firefox 133, the Developer Tools debugger editor now uses Codemirror 6 in Firefox Nightly builds. Developer Tools debugger users should see performance improvements with larger files.

    Bug 1904489

Web Platform

  • Starting with Firefox Nightly 131, support for the non-mandatory options argument to getBBox will get the bounding box of the element, including its stroke (e.g. element.getBBox({"stroke": true})). (Learn more)

    Bug 1914182

  • Starting with Firefox 133, basic features of contenteditable="plaintext-only" are now supported in Firefox Nightly. Firefox still uses <br> elements for line breaks in contenteditable="plaintext-only" even when white-space is pre, pre-line, or pre-wrap. Therefore, textContent of editing host returns one line text even if there are multiple lines.

    Bug 1922723

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