For future reference, it's a good idea to have your data on more than 1 device if you're not doing backups. see screenshot I've never used the Restore Bookmark option, but it should help you. see screenshot https://kb.mozillazine.org/Backing_up_and_restoring_bookmarks_-_Firefox#Restoring_bookmarks_from_backup https://support.mozilla.org/en-US/kb/recover-lost-or-missing-bookmarks#w_my-bookmarks-have-disappeared