The same way you backup your non-firefox stuff, with some form of backup program/system. I've been using rsnapshot (https://rsnapshot.org/ https://rsnapshot.or

The same way you backup your non-firefox stuff, with some form of backup program/system. I've been using rsnapshot (https://rsnapshot.org/ https://rsnapshot.org/) for a number of years now, and I'm slowing migrating into restic (https://restic.net/ https://restic.net/).