Download Firefox

Firefox is no longer supported on Windows 8.1 and below.

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

Firefox is no longer supported on macOS 10.14 and below.

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

Firefox Privacy Notice

Firefox ESR
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.

91.4.0 Firefox ESR

December 7, 2021

Version 91.4.0, first offered to ESR channel users on December 7, 2021

New

  • Firefox PDF viewer now supports filling more forms (XFA-based forms, used by multiple governments and banks). Learn more.

Fixed

Get the most recent version

All Firefox ESR downloads