Why we love Mozilla Persona
In principle, Persona is great. Not storing passwords is awesome, a non-FB/Google/Twitter identity option is important.I would encourage you, though, to look carefully at your login completion metrics. I implemented Persona on my site (http://www.sixquestions.co) to have a pure email option and although users clearly prefer it, about 35% complete the Persona login flow successfully. That's 10 points lower than our next-worst performer (Twitter), and half the rate of our best performer (Facebook). For all the concerns people have with authorizing Facebook/Twitter access, that is (in my view) offset by the alien-ness of Persona's login flow. We've heard from lots of users that logging in with Persona is unusual and they thought they were doing something wrong because they'd never seen anything like that.So, as much as I believe in Persona, I'm about to deploy a change that removes it entirely. It adds a lot of surface area to our testing and future development, but if it means we lose fewer users in their signup flow, it will be worth it.