Increasing the size of the cinema mode to fill the screen is incredibly useful, and I use this larger cinema mode rather than going fullscreen. The popout view for the video is also nice, as this allows you to watch the video while you read the comments if you wish, and it's easy to close if you don't want it there, so it doesn't get in the way. Being able to resize the popout view is also useful, as if it is too large for you, you can make it smaller, or if it is too small, you can make it larger. However, a recent update has made the addon's toolbar cinema mode button no longer make YouTube go out of cinema mode, it only gets rid of the page dimming.