Firefox ESR

August 17, 2021

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

All Firefox ESR downloads