The following alternative login options are available for sites migrating away from Persona. We will continue to update this page throughout the year.
We intentionally designed Persona to expose email addresses rather than opaque identifiers, which should ease the transition to other systems that provide verified email addresses.
Mozilla-hosted sites may find additional, staff-login-specific migration options on the [https://mana.mozilla.org/wiki/display/Identity/Persona+migration+guide+for+internal+sites internal mana page].