Extract youtube videos from playlist

script.js

var els = document.getElementsByTagName('a');
var urls = [];

for (var a=0; a<els.length; a++) {
    var item = els[a].href.toString().trim();
    if (item.indexOf('watch') != -1) {
        var url = item.split('&');
        url = url[0].toString().trim();
        
        var found = false;
        for (var b=0; b<urls.length; b++) {
            if (urls[b] == url) {
                found = true;
                break;
            }
        }

        if (found == false) {
            urls.push(url);
        }
    }
}

var list = '';
for (var a=0; a<urls.length; a++)
    list += urls[a] +"\n";

document.body.innerHTML = `<textarea>`+ list +`</textarea>`;