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.

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

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

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