See what’s new in Firefox!

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.

140.0.4 Firefox Release

July 8, 2025

Version 140.0.4, first offered to Release channel users on July 8, 2025

New

  • Firefox's QUIC stack is moving to a Rust based UDP I/O stack that leverages various modern, operating system specific calls, resulting in improved HTTP/3 upload and download performance.

    This feature is part of a progressive roll out.

    What is a progressive roll out?

    Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.

Fixed

  • Fixed incorrect font selection in some cases when attempting to use color fonts. (Bug 1971053)

  • Fixed the search results not updating when switching source during a file search in the Developer Tool's debugger. (Bug 1971094)

Get the most recent version

All Firefox downloads