(function() {

    "use strict";


 	function setResolution(ytPlayer,targetRes){
		ytPlayer.setPlaybackQualityRange(targetRes, targetRes);
        ytPlayer.setPlaybackQuality(targetRes);
	}

    function main()
    {

        let ytPlayer = document.getElementById("movie_player") || document.getElementsByClassName("html5-video-player")[0];
        let ytResolutions = ytPlayer.getAvailableQualityLevels();
    	let targetRes = ytResolutions[ ytResolutions.length-2];

		setResolution(ytPlayer,targetRes);
		window.addEventListener("loadstart", function(e) {
                if (!(e.target instanceof window.HTMLMediaElement))
                {
                    return;
                }

                ytPlayer = document.getElementById("movie_player") || document.getElementsByClassName("html5-video-player")[0];

               setResolution(ytPlayer,targetRes);
            }, true );
        window.removeEventListener("yt-navigate-finish", main, true );
    }

    main();
	window.addEventListener("yt-navigate-finish", main, true );
})();