First impression: great application, I can finally use it to sign in some small sites or blogs that might have security concern. A little advice, I already hold multiple e-mail addresses for different use. If I could "customize the forwarding email address", that would be awesome. I could forward the spam&suspicious emails only to my "various special email addresses" and deal with them there, instead of the single important email address that I used for logging in to FireFox, which adds one more layer of protection. All in all, great service and great idea!