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I have synced my browser, but now all my bookmarks are gone. How can I revert to "pre-Sync" version (restore)

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How can restore my bookmarks from my previous version, as it synced with a crashed and newly installed computer with the same name but empty bookmarks.

How can restore my bookmarks from my previous version, as it synced with a crashed and newly installed computer with the same name but empty bookmarks.

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You can check for problems with the places.sqlite database file in the Firefox profile folder.

If you use Sync then best is to disconnect Sync (temporarily) while performing maintenance/repair efforts to the places.sqlite database.