Can you open this backup file in a Firefox tab to verify that the file is valid HTML and has your bookmarks?

You can check for problems with the places.sqlite and favicons.sqlite files in the Firefox profile folder.

• use the "Places Database" -> "Verify Integrity" button in "Help -> More Troubleshooting Information" (about:support)

If errors are reported with "Verify Integrity", close and restart Firefox or reboot the computer and retry.

I cleared the startup cache. Everything came back.

Where should I store a backup of my bookmarks? I thought they'd land in the Library, but they didn't.

Since I didn't understand most of what you suggested, I can't say you solved the problem. But it is solved.

Hello,

Firefox automatically creates backups of your bookmarks, which can be helpful if your bookmarks are lost or missing. To recover them, follow the instructions below.

1. Click the menu button , then click Bookmarks.
2. Scroll to the bottom and click Manage Bookmarks.
3. At the top of the Library window, click on Import and Backup and select Restore.
4. Click the date of the bookmark backup you want to recover.
5. In the new window that appears, click OK.

Your bookmarks from the selected date should now be restored.

For more information, see the Restore bookmarks from backup or move them to another computer article. For other solutions, see the Recover lost or missing Bookmarks article.

Did this fix your problems? Please report back to us!

Thank you.