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.

145.0a1 Firefox Nightly

September 15, 2025

Version 145.0a1, first offered to Nightly channel users on September 15, 2025

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 Bluesky account, our @FirefoxNightly 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 143, Firefox Nightly now blocks local network requests by default and only allows them if the user grants access through a permission prompt, strengthening protection against attacks targeting local network services.

    Bug 1972350

Changed

Developer

Web Platform

  • Starting with Firefox 144, layer compositor is enabled for WebRender on Windows in Firefox Nightly.

    Bug 1945683

Get the most recent version

All Firefox Nightly downloads