/**
 *  @author https://codepen.io/bookmarklets
 *  @file Grab the MP3 of a YouTube video
 *  Original Source {@link https://cdpn.io/bookmarklets/fullpage/NobJbq#}
 */

javascript:window.location=document.URL.replace("https://www.youtube.com/watch?v=","https://ytmp3.com/download/");