If it depends on JavaScript, it's still the problem. Mozilla has the browser, why not implement it without JaveScript? There are already more authentication methods which don't require JavaScript.
Yeah, I hear you. Still, for Persona / BrowserID to be successful, it has to support users regardless of browser. Choosing JavaScript means that we can build a solution that works for the whole web.
You should still implement non-js solution in Mozilla immediately to demonstrate how it's going to work once accepted.
js-based auth doesn't work for the whole web. Even for other browsers you have to make a solution where everything server can get the e-mail address without javascript on the client.
And you should definitely explain protocol as simple as possible for everybody who implements it to understand what's going on and how your services can be replaced by something else. That is, if you're serious about having a real cross-browser solution.
