I'm definitely giving up although I'm convinced about Mozilla values... The The bookmarks and history system will not be functional" error message is really driving me nuts! I followed first your "Fix..." instructions; it worked for a few days, and then back again without any bookmark. After that, all of a sudden, miracle! I got back all my bookmarks without any action! Today, once again, I've been waiting for weeks for my bookmarks to be available on Firefox... I imported them to Edge and I'm now using Edge.