// ==UserScript==
// @name        Youtube Age Confirmation Bypass
// @namespace   kneels
// @description Prevents you from having to sign in to view age restricted videos on YouTube
// @include     https://www.youtube.*/watch*
// @include     http://*.youtube.*/watch*
// @include     https://*.youtube.*/watch*
// @match       http://*.youtube.com/watch*
// @match       https://*.youtube.com/watch*
// @version     1.4
// @grant       none
// @downloadURL none
// ==/UserScript==

var el = document.getElementById('unavailable-submessage');
if (el.childNodes.length > 1) {
   var embedString =   "<iframe width=\"100%\" height=\"100%\" src='" + 
       getEmbedUrl() +  
       "?autoplay=1' frameborder=\"0\" allowfullscreen></iframe>";
   document.getElementById('player-unavailable').innerHTML = embedString;   
}

function getEmbedUrl()
{
    var urlStr = window.location.href.replace('watch?v=', 'embed/');
    var junk = urlStr.indexOf("&");
    if(junk != -1) {
       urlStr = urlStr.substr(0, junk);        
    }
    return urlStr;
};