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.

91.0.1esr 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

  • Security fix

Developer

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