Cool add-on. I noticed it doesn't work on live videos (doesn't show the new button and the shortcut key doesn't work). Is this a known limitation or could it be something related with my specific configuration? Also, if I use the old youtube interface, the top bar (with the YT logo, search bar, etc.) overlaps the full-screen videos, but I doubt that this will affect many users as it's getting harder to disable the material design UI/polymer framework. Thanks for the add-on!