This is my first attempt at programming, I saw in a site a link that when I bookmark it would serve to download a video from youtube that only in mp3 format, however it did not work, when trying I understood why and tried to fix, I could do partially because in the result the symbols appear in the form of code and I can do nothing to remove it
javascript:(function() {if (location.href.indexOf('youtube.com') > -1) {window.open('http://youtubeplaylist-mp3.com/download/index/' + encodeURIComponent(location.href) .replace("https", "") .replace("youtube", "") .replace("www.", "") .replace(".com", "") .replace("watch", "") .replace(/[%3A]/, '') .replace("", "") .replace("", ""));} else {alert('So funciona no youtube carambola');}})();