OpenID Plugin for firefox

It would be really cool to have an OpenID plugin for firefox that enabled the browser to manage you ID. So as you approached an OpenID site it would pop up a dialoug to ask you if you wanted to create an account and what info to share or if you already had an account then log you in without the need for any interaction.

OpenID, or something very like it, is how we can solve this mess of bad passwords and get back to a sane single sign-on for the whole internet. Perhaps it may require some levels to be assigned so things like Banks required a bit more auth but the general idea is sound.