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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.

Firefox Nightly — English (US)

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Firefox Nightly — English (US)

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120.0a1
Firefox Nightly

September 25, 2023

Version 120.0a1, first offered to Nightly channel users on September 25, 2023

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, our @FirefoxNightly@mozilla.social Mastodon 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.

New

  • Starting with Firefox 118, Nightly now supports UI setting that enables the user to opt-in into GPC, a privacy signal that tells the websites that the user doesn’t want to be tracked and doesn’t want their data to be sold.

    Bug 1830623

  • Picture-in-Picture now supports corner snapping on Windows and Linux - just hold Ctrl as you move the PiP window.

    Bug 1772404

Developer

Web Platform

  • Starting with Firefox 117, partial support for the custom highlight API is now available in Nightly builds, allowing web developers to give ranges an appearance.

    Bug 1840818

  • Starting with Firefox 119, the :has() selector is now available in nightly builds. This allows authors to match elements that has, or "anchors", at least one element matching its relative selector.

    Bug 1853701

Get the most recent version

Firefox Nightly — English (US)

Your system may not meet the requirements for Firefox, but you can try one of these versions:

Firefox Nightly — English (US)

Firefox Nightly is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

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Firefox Nightly is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

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All Firefox Nightly downloads