Hi guys,
You should make it that I can log into my firefox account in my desktop browser from my phone. You'd display a barcode (or the other types) on the screen. If I'm logged into my phone, I'd read it on the phone, and then it would send the signal to the browser to login. The reverse might be also useful, or even expanding it as a more general service. I don't know, this might just be a moronic suggestion.