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It actually uses Persona inside, and it's an email-as-ID as well.

Also, this is a new occurrence of scrypt used in the wild.

That's not quite accurate; Firefox Accounts uses the BrowserID Protocol, of which Persona is an implementation. That is to say, it authenticates using BrowserID assertions, but does not directly tie in to Persona accounts. Yet.

https://developer.mozilla.org/Persona/Glossary

You mean it doesn't use Mozilla's bridge? Presumably, if you have your own IdP, it will use it, since it uses BrowserID.

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