This morning, I brought up Firefox and found my bookmarks (including the toolbar) had vanished. I tried restoring my profile folder, but that didn't help. I also tried restoring the bookmarks from Firefox's own backups, but I got some "Unable to process backup file." messages. What do I do now?
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Update: I uninstalled and reinstalled Firefox. My extensions were preserved, but I had the same problem with my bookmarks.
If you use Sync, best is to disconnect Sync temporarily during troubleshooting.
This could be a problem with the places.sqlite and favicons.sqlite files in the Firefox profile folder.
- use the "Places Database" -> "Verify Integrity" button on the "Help -> More Troubleshooting Information" (about:support) page
If errors are reported with "Verify Integrity", close and restart Firefox or reboot and retry.
If "Verify Integrity" cannot repair places.sqlite, rename/remove all places.sqlite and favicons.sqlite files in the Firefox profile folder with Firefox closed. Firefox will rebuild places.sqlite and restore the bookmarks from the most recent JSON backup in the bookmarkbackups folder.
- keep a backup copy of places.sqlite in case a new places.sqlite database has to be created
- you lose the history when a new places.sqlite is created
You may have to restore an older bookmarks backup in the bookmarkbackups folder via the Bookmarks Manager (Library).
- Bookmarks -> Manage Bookmarks -> Import & Backup -> Restore
You can use the button on the "Help -> More Troubleshooting Information" (about:support) page 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
- I'd already deleted favicons.sqlite and places.sqlite; it didn't help.
- I "verified integrity;" no problems were detected.
- I was able to access my bookmarks in Edge, which surprised me.
- Firefox hung and then crashed and rebooted.
- I tried restoring from an older backup, which worked.
- I tried restoring from a more recent backup that had failed to update; this time, I had no problems.
It appears that all is now well, although I have no idea why. If I have more trouble, I'll repost.