Does what you want, when you want it. Would be nice if it didn't have to be that green color, but in terms of functionality: It is a great addition to the app and should probably just be a built-in feature.
Works as advertised. I'm on a Mac and I really dislike the gray icons. In some cases I have to put tweaks in the userChrome.css to change to a colored icon. This add-on is in color so no tweaks required. GREAT!