Really simple and easy to use addon that does what is described. :)

YouTube often selected 720p or sometimes lower settings, even on a 100mbit connection with a 1440p panel, so I kept having to manually select the quality with every video, but now I don't have to! :)

The best way to view videos when watching them on an Android Box (TV) with UHD (4K). Always the best resolution all the time.