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After I formatted the computer, I installed Firefox, logged user but the data are not synchronized

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After I formatted the computer, I installed Firefox, logged user but the data are not synchronized. I lost all my passwords and bookmarks..

After I formatted the computer, I installed Firefox, logged user but the data are not synchronized. I lost all my passwords and bookmarks..

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It is always a good idea to backup your data locally to prevent dataloss if you reinstall the Operating System.

Note that the current Firefox 29 beta release is using the new Sync version that uses a Firefox account.