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Does firefox delete sync data if i click on sync now button on a fresh copy of mozilla

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I formatted my laptop and logged in to ff account to sync. After waiting 20 minutes with nothing appearing , i clicked on sync now button from tools. Does that replace my existing data with the data from the freshly installes firefox or what.

I formatted my laptop and logged in to ff account to sync. After waiting 20 minutes with nothing appearing , i clicked on sync now button from tools. Does that replace my existing data with the data from the freshly installes firefox or what.

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No, it does not.