// ==UserScript==
// @name youtube no title wo ue ni
// @include http://www.youtube.com/*
// ==/UserScript==
(function () {
var pa = document.getElementById('player-api');
var wht = document.getElementById('watch-headline-title');
wht.style.fontSize = '1.2em';
pa.parentNode.insertBefore(wht, pa);
})();

動くけど何故かエラー出るm9(^Д^)