Removes those annoying, clickable labels for "Watch Later" and "Add to Queue" buttons that are on some YouTube video thumbnails so that you won't accidentally click on them. It doesn't remove the buttons. It also does not affect the non-clickable tooltips that appear on thumbnails besides videos - those are fine because you can't accidentally click on them. The only reason you should install this is if you sometimes find yourself clicking "Watch Later" or "Add to Queue" when you're just trying to open a video.