Great add-on, really enjoying the customization! There's just one thing I lack here: A blacklist for channels that use ads. I know it might sound a little evil, but I really want to keep the ads on youtube, but some channels just like to take advantage of it and put ads once every 30 seconds, and make the video unwatchable, the ads taking more time than the actual video. And I really wouldn't want other "good" channels to suffer because of that. So that's just a little suggestion of improvement I got there. But besides that, everything's perfect, and it's just what I've been looking for!

(PS: Firefox recommended this add-on for me while I was on youtube)