Hi Artoo, the Restore list should show available automatic bookmark backups. Do you want to erase the backups, or reduce the number of backups Firefox makes?

The automatically created backups are placed in the bookmarkbackups folder in the Firefox profile folder, so you can remove the files in this folder to cleanup the list.

You can use the button in "Help -> More Troubleshooting Information" (about:support) to go to the current Firefox profile folder or use the about:profiles page (Root directory).

• Help -> More Troubleshooting Information -> Profile Folder/Directory:
  Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder
• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data