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91.0.1 Firefox Release

August 17, 2021

Version 91.0.1, first offered to Release 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

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