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Firefox did not sync older devices information (bookmarks, history ) when i tried to logged in the new device with same email.

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I have used synce on my old desktop and when i logged in the new desktop with same sync account, nothing from old desktop got sync. I mean , i have lost every thing (Bookmarks, History, form data) etc as sync did not worked. Any chance of getting the old data ?

I have used synce on my old desktop and when i logged in the new desktop with same sync account, nothing from old desktop got sync. I mean , i have lost every thing (Bookmarks, History, form data) etc as sync did not worked. Any chance of getting the old data ?

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Did you change the password or request a new password of the Sync account?

Changing the password of the Sync account will wipe all data stored on the sync server.

Note that is can take some time to sync all data with the initial sync.

You can check the about:sync-log page via the location/address bar to see if there are recent error logs available.