I didn't know about that untill now. I'll look more into it. But the main idea behind the way accounts work on FS is that the user should have some sort of onli

I didn't know about that untill now. I'll look more into it. But the main idea behind the way accounts work on FS is that the user should have some sort of online presence before he can sign up. So if Mozilla's Persona doesn't offer a way for the user to publish some sort of online profile, then we probably won't add it as a primary form of signing up on FS. Linking an existing account to authenticate later is ok. But we do want to make it more difficult to create completely "anonymous" profiles. At least that's our thinking today anyway.