Undo recent sync
Is there a way to return to a previous sync? I rebooted up an old computer that was my original firefox account. once I relaunched firefox i re-synced all my firefox devices to that old computer. So all the bookmarks and such were messed up.
Alla svar (1)
For the bookmarks you can restore a recent backup in the bookmarkbackups folder.
Other data can only be restored if you have a backup. You can look a utility to browse System Restore points.
You can check if you have a C:\Windows.old folder with your Firefox profile data. You can check if you have an "Old Firefox Data" folder on the desktop when the Refresh feature in Firefox has been used and a new profile has been created.