Like, for example, "we have this many users in this, that and that countries" - information which ads brokers might require to draw up a contract.

I suppose this is a change from the original "never and nothing" promise, but still a fair distance from the idea of selling of data that most people would imagine, like tracking and sharing your individual browser history.

[I guess I'm biased in favor of Mozilla. If they kick it, among full-featured browser engines only Chromium remains.]