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I have two copys of sync data for the same firefox account

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it bother me so much. i have use my Firefox at different PC with the same account. While they don't sync the same thing. it seems they have two copy data in the cloud for my account. All by bookmarks didn't sync between them(same account, different copies) How to solve it? Thanks

it bother me so much. i have use my Firefox at different PC with the same account. While they don't sync the same thing. it seems they have two copy data in the cloud for my account. All by bookmarks didn't sync between them(same account, different copies) How to solve it? Thanks

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Sync doesn't save two different sets of data in one Sync account. Data from each device gets merged on the Sync server, and sends the data that differs to each device.

About the only difference in "data" you might see is with the Bookmarks Toolbar when Firefox for iOS or Android is connected to that Sync account. Plus, all bookmarks on "desktop" won't get synced to a "mobile" device; similar for browsing history, which restricted to recent history going to "mobile".

And when a Master Password is used on one device and not on another device connected to that Sync account.