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how can I unsync my bookmarks

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I recently synced my bookmarks and now have decided I want to undo that. How can I unsync what I have done? So I want to remove all the bookmarks without doing it manually which would take a very long time

I recently synced my bookmarks and now have decided I want to undo that. How can I unsync what I have done? So I want to remove all the bookmarks without doing it manually which would take a very long time

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Sorry that isn't possible. Once a Sync process is done the bookmarks are on the local device "for good", neither Firefox nor Sync have an undo function for Sync.

Have you tried restoring a BookmarksBackup file from the day before you connected that device to Sync? Firefox automatically backs up bookmarks daily and stores 15 backups in current versions of Firefox.

https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them#w_restoring-from-backups