[dave1010uk]

Wasn't one of the benefits that you don't need to rely on a third party service?

[JoshTriplett]

The third-party service handles the case where the user's browser doesn't handle BrowserID natively, which makes it possible to adopt this service without waiting for user's browsers to catch up.

[ignifero]

I believe you will definately rely on one (of many possible) 3rd parties.