This happened on Sunday, March 13th not sure what time. I think Firefox did an auto update but not sure. My bookmarks toolbar disappeared, as did ALL my bookmarks. I double checked and yes my bookmark toolbar is visible but empty. If I try to add a bookmark it fails, nothing happens. I can't import an old bookmark file in html nor can I restore any of several backups. I have tried following ALL the troubleshooting solutions for missing bookmarks and for resetting all toolbars and none of these work. Can anyone help?