If you open an YouTube video and right click on it you'll see a new Pop Out
option. It does take a few seconds to " load"
It's a TV-optimized interface. There are new buttons for pausing the video, fast forward and rewind, searching YouTube and visiting a visual homepage.
An image I took
Click the "home" button or press "g" to find videos from various categories like sports, science, comedy, news, music.
Use the keyboard arrows to navigate to a different category and browse the videos. Press "Esc" to go back to the previous screen.