[fmarier]

It's definitely in line with what Persona does. After all, Persona evolved from the "Verified Email Protocol" (https://wiki.mozilla.org/Labs/Identity/VerifiedEmailProtocol).

Right now, our fallback identity provider (for email providers without native support) requires that people set a password to avoid having to confirm their email every time. However, we're currently exploring the idea of making the password optional and letting users click an email link at every login, just like the author of that article suggests.

I don't think it works for everyone, for example some people read their email on a different device, but it would certainly work for those who always keep their webmail open in a tab.