Simple script that adds video tags back on YouTube

youtube_tags.user.js

// ==UserScript==
// @name        YouTube Tags
// @description Shows video tags
// @version     1.0.1
// @author      moh <moh@yutsuku.net>
// @include     https://www.youtube.com/watch*
// @include     http://www.youtube.com/watch*
// @grant       none
// ==/UserScript==

(function() {
	if ( window.location.host == "www.youtube.com" && window.location.pathname == "/watch" ) {
		var appendHere = document.querySelectorAll("#watch-description-extras .watch-extras-section")[0]
		var list = document.getElementsByTagName("meta")
		var tag_list = ""
		for(i=0;i<list.length;++i) {
			if ( list[i].getAttribute("property") == "og:video:tag" && list[i].getAttribute("content") != null) {
				tag_list += "<li> " + list[i].getAttribute("content") + "</li>"
			}
		}
		appendHere.insertAdjacentHTML('beforeend', '<li class="watch-meta-item"><h4 class="title">Tags</h4><ul class="content watch-info-tag-list">' + tag_list + '</ul></li>');
	}
})();