Found out that Persona team do encourage this: https://developer.mozilla.org/en-US/docs/Persona/The_implementor_s_guide https://developer.mozilla.org/en-US/docs

Found out that Persona team do encourage this: https://developer.mozilla.org/en-US/docs/Persona/The_implementor_s_guide https://developer.mozilla.org/en-US/docs/Persona/The_impleme... Personally, I wouldn't call email addresses identities, and just say they're credentials. But Mozilla clearly has another idea on what the identity is.