https://www.bleepingcomputer.com/news/software/mozilla-rolls-out-new-firefox-version-to-fix-windows-reboot-bug/

Mozilla today started rolling out Firefox 82.0.1, a new version that fixes a known bug where the Windows installer displays unnecessary reboot prompts on some systems after it finishes the installation.

"This would affect anyone running a full installer (not the stub installer)[..], provided they have at least one other Firefox installation in a directory other than the one that they just installed into (that is, having one existing installation which you are paving over wouldn't trigger this, there has to be a different one)," Mozilla engineer Molly Howell explained on the company's bug tracker.