Yeah, I found this out the other day when my laptop was toasting. In hindsight, probably related to archive.today or some Firefox extension.

You have to close Firefox every now and then for updates though. The issue you describe seems better dealt with on filesystem level with a CoW filesystem such as ZFS. That way, versioning and snapshots are a breeze, and your whole homedir could benefit.

FWIW: the Tab Stash extension has worked well for me.