In the Library window, click the Import and Backup button and then select Restore. 

   Select the backup from which you want to restore:
       The dated entries are automatic backups.
       Choose File... lets you restore from a manual backup (see above). 
   After choosing a backup, your bookmarks from that file will be restored. Close the Library window. 

hi, today i opened firefox and all my bookmarks on the screen where gone i tried to import them back ( have 8 or nine different dates that i can restore it to) i can click on the dates provided and a pop up says that it will restore it to that particular date. But nothing happens . i tried everything and the settings are right Remember my browsing and download history is on. History is shown after recover but bookmarks are not recovered and shown Click the Bookmarks button Bookmarks button win 2 on the right side of the navigation toolbar and select Show All Bookmarks to open the Library window. In the Library window, click the Import and Backup button and then select Restore. Select the backup from which you want to restore: The dated entries are automatic backups. Choose File... lets you restore from a manual backup (see above). After choosing a backup, your bookmarks from that file will be restored. Close the Library window. This happened suddenly that bookmarks where gone. i had no update of any sort Thanks