It has happened now for quite a long while and quite some times that the bookmarks, with the exception of the "Import Bookmarks", disappear from Bookmarks Toolbar. There was a time when I succeeded in solving the problem by removing the <places.sqlite> file, but or the last 2 instances it did not work. In the first of these two later instances I resorted finally to reinstalling Firefox after the deletion of <places.sqlite>, <places.sqlite-wal> and <places.sqlite_shm> - I am not sure about the spelling of this last two - without success. Today, running 144.0 64-bit for artlinux 1.0, that did not work. I did <pacman -R firefox>, in order to remove it and then <pacman -Su firefox>, to install it but that did not work and to my surprise, my bookmarks appeared on the Library so I removed and installed one more time, making sure to delete the <.mozilla> before installing again. I just reporting in case it may be helpful to someone.