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I think you only have to do the email verification one time. After that, you'll be able to log in to any BrowserID site without entering anything.

Indeed; I believe it authenticates your browser (or perhaps only your browser session?) across all BrowserID-using sites, drastically cutting down on the number of times you'd have to type in a password.

Right, this is caving cowpaths. Most sites have this flow, so if we can lift that up into the Browser and your Primary identity provider, than you can stop doing this on each new website you visit.

It doesn't aim to solve that issue. It aims to solve the issue of maintaining multiple passwords on multiple sites.