I think there is a token being passed, but it's authentication, not identity. It's a signed declaration that you own that identity, and it must be either from t

I think there is a token being passed, but it's authentication, not identity. It's a signed declaration that you own that identity, and it must be either from the domain that issued it, or another source that the site you're visiting specifically trusts (i.e. Mozilla, at present). I trust Mozilla to have done a good job of this. If there's a weakness, it's not going to be anything so obvious that you can see it from my stumbling attempts to describe the protocol. If it sounds like there is, I'm probably describing it wrong. Have a look at the details here: http://lloyd.io/how-browserid-works http://lloyd.io/how-browserid-works