My bookmarks have disappeared from Firefox. No of the restore and backup commands have failed. I have tried to import bookmarks from Edge. I says that it exported them but they don't show up in Firefox. None of the restore import or backup commands will open the box that will let you select an option. I have tried uninstalling Firefox and re-installing it. Same problem. I cannot create new bookmarks either. I want to keep using Firefox, as I have used it for years but I need bookmarks. Help