YouTube Player for edX

script.user.js

// ==UserScript==
// @name         YouTube Player for edX
// @namespace    morhaus
// @version      1.1
// @description  Replace the default edX video player with the YouTube player
// @author       Alexandre Kirszenberg <alexandre.kirszenberg@gmailcomr>
// @match        https://courses.edx.org/*
// @match        https://courses.ionisx.com/*
// @grant        none
// ==/UserScript==

var oldFn = window.onYouTubeIframeAPIReady || null;
window.onYouTubeIframeAPIReady = function() {
    var Player = YT.Player;
    YT.Player = function(el, opts) {
        new Player(el, {
            videoId: opts.videoId,
            events: {
                onReady: function(e) {
                    document.querySelector('.video').className += ' is-initialized';
                    e.target.setPlaybackQuality('highres');
                },
            },
        });
    };
    window.onYouTubeIframeAPIReady = oldFn;
    oldFn && oldFn();
};