So, after installing this extension, a page opens with a link "configure extension". But if you thought that pressing this link brings you to where you can actually handle the add-on's configuration, you're sadly mistaken. Because it really brings you to a page where the author is advertising himself and all of his other extensions.

I'm not yet sure how well this add-on works, but for the misslabeling of buttons and the blatant spam attempt, it starts at a disadvantage where the rating is concerned! If only I could apply a negative rating...