Get ảnh, video từ Facebook\Instagram

javascript:
var host = window.location.hostname;
var pathname = window.location.pathname;
var fullurl = host + pathname;
var ps = fullurl.split("/")[1];
switch (host) {
    case "www.instagram.com":
        switch(ps) {
            case "p":
                try {
                var URL = window.location.pathname;
                var insd = "http://insd.ga"+URL;
                window.open(insd, '_blank');
                }
                finally{
                        var videoins = document.getElementsByClassName("_l6uaz")[0].src;
                        window.open(videoins, '_blank');
                }
            break;
            case "stories":
                    var photo = document.getElementsByClassName('_ntjhp')[0].src;
                if(photo == null){
                    var video = document.getElementsByClassName('_ntjhp')[1].getElementsByTagName('source')[1];
                    var link_video = video.src;
                    window.open(link_video, '_blank');
                }
                else{
                    window.open(photo , '_blank');
                }
            break;
            default:
                window.open("http://insd.ga", '_blank');

        }
    break;
    case "www.facebook.com":
                try
                    {
                        var story = document.getElementsByClassName('_5i4g')[0].src;
                        window.open(story, '_blank');
                    }
                finally
                    {
                        var get = document.getElementsByClassName('_7yy')[0].innerHTML;
                            document.write(get);
                    }
    break;

    default:
         window.open("https://www.facebook.com/insdown", '_blank');

}