Hi Daniel, that's a little odd: there are some settings to clear history, but there definitely aren't any settings to delete bookmarks. Has Firefox mentioned having to create a new profile, or wanting to do a Tune-up or Refresh? Just in case you're working in a fresh new profile, could you check the first section of the following article: [[Recover lost or missing Bookmarks]] If Firefox performed a Refresh, there would be a folder on your Mac desktop named "Old Firefox Data". Do you have that folder? If so, could you check its contents to see how recently they were updated?