// ==UserScript==
// @name         Rickroll Avoider
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://www.youtube.com/watch?v=dQw4w9WgXcQ*
// @icon         https://www.google.com/s2/favicons?domain=youtube.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    alert("This is a rickroll! The audio is muted and the video is hidden luckily. Close out!");
    var elems = document.getElementsByTagName('div')[0];
    elems.remove();
    var elems1 = document.getElementsByClassName('html5-video-container')[0];
    elems1.remove();
})();