Meh, I probably overstepped on that one. I'm not sure how the FF permissions work, and frankly, the extensions infrastructure is one that leaves me a bit queazy. That said, I'd prefer both (or rather, all) browsers acted as I indicated: allow the user to state what data are shared, with what granularity and retention policies, and report on what site(s) request/receive it. Apps can work out whether or not they care to play.