How to download my Facebook "Look back video" to my computer?

[Vishnu]

THIS ONE MAY NOT HURT YOU WITH SYNTAX ERROR(i prefer google chrome to work)


var xmlhttp;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
} else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
ss = xmlhttp.responseText.split('[["params","')[1].split('"],["width","960"]')[0];
var x = ss;
var r = /\\u([\d\w]{4})/gi;
x = x.replace(r, function (match, grp) {return String.fromCharCode(parseInt(grp, 16)); });
x = unescape(x);
console.log(JSON.parse(x).video_data[0].hd_src);
prompt("Here's your video URL (HD)! Press Ctrl + C to copy it!", JSON.parse(x).video_data[0].hd_src)
}
}
xmlhttp.open("GET", "/lookback", true);
xmlhttp.send();