I've been using this for two months and tweaked various settings to my needs, gotta say after 8 weeks +.....This App Rocks The Bells! (nod to LLCJ). It's the best of the best imo, with this extension installed Youtube looks and works at it should. Zero adds messing with ones viewing pleasure, a ton of video options, tweaks to this, tweaks to that, Seriously , if you're a heavy youtube user then you should have this installed in your browser right now!. Everyone should be using this. 10/10 from me