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

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

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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.

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

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.

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91.0.1esr
Firefox ESR

August 17, 2021

Version 91.0.1esr, first offered to ESR channel users on August 17, 2021

Fixed

  • Fixed an issue causing buttons on the tab bar to be resized when loading certain websites (bug 1704404)

  • Fixed an issue which caused tabs from private windows to be visible in non-private windows when viewing switch-to-tab results in the address bar panel (bug 1720369)

  • Various stability fixes

Get the most recent version

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

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.

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All Firefox ESR downloads