I found all bookmarks gone on both my work computers, but after updating firefox, they reappeared on one of the computers. After updating a couple of times, the other computer still shows no Bookmark toolbar and gives me a blank "library" page when I click on "show all bookmarks" or "Unsorted Bookmarks" from the menu bar. I can click on the star and still get the save bookmark popup, but I have no idea where that saved webpage gets saved to as it never shows up again. I also use Firefox on my home computer, but have had no problems with my bookmarks there.