Does this apply to the Google bridge as well? How much do we trust Persona/Mozilla?
There's still the fallback login, right? So I could use hippy@utfs.com or whatever?
Persona does not track your activity around the Web. It creates a wall between signing you in and what you do once you're there. The history of what sites you visit is stored only on your own computer.
You can use any email address with Persona, whether it's a Google account or not only affects whether Persona asks you for a password, or if it relies on your Google account login status.
From https://login.persona.org/about
You can use any email address with Persona, whether it's a Google account or not only affects whether Persona asks you for a password, or if it relies on your Google account login status.