Ah, yes, silly title. I meant to add "toolbar" at the end of that title, which makes it make a lot more sense. Will fix that shortly on the blog.
As for the viewing area, There is one point where the menu goes off to the left side, so I couldn't crop it further (I wanted to keep the window in the center of the video, as well).
Anyway, let us know what you all think of the API we are proposing! We really want to see this take off.
(I'm the author of the blog post/video btw, in case that wasnt clear!)
Let us (the BrowserID team) know if you have any feedback on the experience.