Open Current YouTube in same tab as embed (so it's full screen)

youtube-bookmarklet.js

javascript:(function(){
    var video_id = window.location.search.split("v=")[1];
    var ampersandPosition = video_id.indexOf("&");
    var ytplayer = document.getElementById("movie_player");
    
    var $time = ytplayer.getCurrentTime();
    $time = Math.round($time);

    if(ampersandPosition != -1) {
        video_id = video_id.substring(0, ampersandPosition);
    }
    window.location.assign("http://youtube.com/embed/" + video_id + "?autoplay=1&start=" + $time);
})();