Facebook Look Back video extractor.

help.txt

Hey there,
Use the main.js to download your video, instructions included in that file.
(File is here on this page itself, either above or below this)

If in case, Facebook didn't made a video for you, read this: 
http://on.fb.me/LookBackNoVideo

If you got your video once, and you deleted a timeline post (or anything else)
which made the video disappear from the page, you can still retrieve the 
file from your browser cache.

**Google Chrome**
1. Open a new tab and type in "chrome://cache"
2. Press Ctrl + F to search on page, type "https://lookbackvideo"
3. The URL which gets highlighted are the Lookback videos. 
   Right click the link and choose "Open link in new tab"
4. There's your video! Watch it! Save it! Do whatever.
5*. To save it, just hit Ctrl + S on your keyboard.

**Mozilla Firefox**
1. Open a new tab and type in "about:cache"
2. On this screen, click "List Cache Entries
3. Press Ctrl + F to search on page, type "https://lookbackvideo"
4. The URL which gets highlighted are the Lookback videos.
   Click it. It will open Cache Entry.
5. Now, click the URL which you see labled as "key", almost at the top.
6. There's your video! Watch it! Save it! Do whatever.
7*. To save it, just hit Ctrl + S on your keyboard.

That's how to save the video!

~Akshat Mittal

main.js

/*
Simple JS Script to get Video URL from Facebook's Look Back

Version: 1.1.0
Author: https://www.facebook.com/itsreallyakshat

Copy paste this whole code into Chrome Console and press enter.
You can execure this script on any page on Facebook.
It will give you the video URL, open it, view it, download it, do whatever you want to. :P

The video URL will popup in front of you, press Ctrl + C to copy it.

To do so, open Chrome Console, Ctrl + Shift + J, "Console" tab.
Copy paste the whole thing there.

To share it, just open the link and download it by pressing Ctrl + S.
Upload it to YouTube or wherever you want to. Share, enjoy! :)

Keep Sharing this with everyone! :)

EDIT: No Longer works, Facebook modified!
*/

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();

i can't get it what i have to do ??

This code doesn't work right now. Facebook has changed it and those who previously have lost their video now have a new one back.

same......... it's not working !

Still work, you guys must modified the script. :D