not sure if this addon changes youtube playback resolution to hd like it promises or not.
reason is, because it took me under 10 seconds to remove this addon, because it forces me to use that theater mode when videos are not in full screen mode.

if i want to concentrate on video itself, then i put it on FULL SCREEN, but when i want to look at other parts of the site like recommended videos or comment section. then i want the video to be in the small compact size and stay like that until i say otherwise.