I'm using Ghostery in Opera, one of the first extensions I install in a computer. It works great.
I have a request about the gray-and-white background Ghostery currently uses for text (e.x. Ghostery found the following) and buttons (e.x. Options) in the small pop-up window. How about applying a more fluid and gradient-like background for the entire pop-up window (instead of gray-and-white background)? Images for "Options", "Give us feedback", "Help" buttons would need to have a transparent background.
Also, the selection method in the pop-up window of this new extension for Opera, The Developer Briefcase (https://addons.opera.com/en/addons/ex..., might give you some inspiration.