Works well, even in tandem with another extension that forces videos to open in theatre mode by default.

I just wish there was a way to make this extension only run when the window is maximised, or to only extend width-wise, as if I have a window that is more vertical/portrait shaped (say, half the monitor) the top and bottom third of the window will be filled with black bars, instead of having the like/dislike/share buttons, next video, comments, etc.