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want to reset Firefox 34 Sync data

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want to all reset my Firefox 34 Sync data

want to all reset my Firefox 34 Sync data

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Unlink this Device with all connected devices, then change your Sync account password.

https://support.mozilla.org/en-US/kb/how-do-i-set-up-firefox-sync#w_remove-a-device-from-firefox-sync