1. It's decentralized; email providers provide the authentication. Google doesn't directly support Persona right now, so Mozilla is supporting them via an Ident

1. It's decentralized; email providers provide the authentication. Google doesn't directly support Persona right now, so Mozilla is supporting them via an Identity Bridge that hooks into Google's OAuth functionality. Google doesn't see what site you're signing into, just that you logged into a thing using Persona. Before Identity Bridges, you had to click a verification link in an email; this is a lot better. 2. I don't think Google exposes a way to use OAuth and skip past the list of accounts.