Sure, strictly speaking, of course there were accounts as in "database records". However, users gave no details about themselves, and haven't signed up for anyt

Sure, strictly speaking, of course there were accounts as in "database records". However, users gave no details about themselves, and haven't signed up for anything. No long-term credentials, just a rendezvous point. You used to just open two Firefoxes, start sync setup on the one, copy (or scan) a code to another - boom, done, they're talking to each other.