Hi, You can try to copy the '''bookmarksbackup''' folder or the latest .json file inside from the [http://kb.mozillazine.org/Profile_folder Firefox Profile Folder]. These auto backup files created by Firefox show up in '''Bookmarks''' ('''Alt''' + '''B''') > '''Show All Bookmarks''' > '''Import and Backup''' > '''Restore'''. Also, you can '''Export Bookmarks to HTML''' from the previous menu and the exported file can be later used to '''Import Bookmarks from HTML'''. You can also try to backup the '''places.sqlite''' file which contains both the bookmarks and the history. You can also open the profile folder via Firefox '''Help''' ('''Alt''' + '''H''') > '''Troubleshooting Information''' > '''Open Containing Folder'''. [https://support.mozilla.org/en-US/kb/Backing-up-restoring-bookmarks Bookmarks Backup] [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Files]

If you don't drag just cut and paste. Go to BM you want to move,click and cut, go to F, drop down and click paste.