It’s difficult to backup everything of FireFox, when you reinstall your OS. Firefox Environment Backup Extension ( FEBE ) is a useful extension which backs up your extensions, themes, your bookmarks, preferences, and everything related to your FireFox installation.It can actually rebuild your extensions individually into installable .xpi files which can be used to install the extension.
You can back your complete profile or do a selective backup choosing what to backup.
You can also schedule a backup with the scheduler.
A Debug option is available to go through the steps to find if anything went wrong during the backup process.
Firefox Environment Backup Extension ( FEBE ) — HomePage
Via — TechnoSpot