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Is Firefox signing you in to your Mozilla accounts?
(sh.itjust.works)
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No I do not use any Sync functionality. I purposely don't sync my browser because I don't want any company to know my bookmarks.
Firefox Sync is end-to-end-encrypted. Mozilla cannot see your synced data.
Either way, I have no idea how this is supposed to happen without you entering your credentials into Firefox at some point. Even if Mozilla wanted to be sus, they couldn't just guess which account is yours.