Just trying to improve the YouTube live stream watch page. We want the chat next to the video, and the video should take as much space as possible.
You can find the extension in the Chrome web store here: YouTube Stream Page
By default, the extension will use the default YouTube player and enlargen it. This way you get a screen filling video and chat on the side. You can disable or enable this behaviour with the onsite extension button next to your profile picture in the top right corner. YouTube's theatre mode is untouched.