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Older version of synchronization !

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Hello. I use an older version of Firefox, and an older version of synchronization. After reinstalling the operating system encountered a problem transferring all my passwords and bookmarks to the new version of synchronization. I can't do this. Is that even possible?

Hello. I use an older version of Firefox, and an older version of synchronization. After reinstalling the operating system encountered a problem transferring all my passwords and bookmarks to the new version of synchronization. I can't do this. Is that even possible?

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You're going need Firefox 28.0 to recover your data from Sync. Then update to Firefox 29.0.1 and update your Sync account.

https://support.mozilla.org/en-US/kb/how-to-update-to-the-new-firefox-sync