Integrate SSleath's button into FF identity button

[KOLANICH]

Because having 2 buttons for the same purpose is a bit weird

[sibiantony]

Had thought about this before. The reason I went for a separate button was that I wanted the rating to be displayed somewhere prominently, without having to go through mouse-clicks. Also the identity button and the popup is constantly evolving (if you see the current nightly you'll get an idea). Although not unstable, integrating now may not be a good idea.

But PRs are welcome. ;)