By default firefox saves your bookmarks to ~/.mozilla/firefox/$PROFILE.default/bookmarkbackups You can see there a bunch of *.json files. ls   ~/.mozilla/firefox/*.default/bookmarkbackups bookmarks-2010-07-07.json  bookmarks-2010-07-29.json  bookmarks-2010-08-03.json  bookmarks-2010-08-05.json  bookmarks-2010-08-06.json  bookmarks-2010-08-10.json If you use more than one machine or you’ve recently changed / reinstalled your OS and you want to restore the old bookmarks, you need to import them manually: backup [...]