It's quite straightforward actually. You just need to know how to find your individual cookies.
Chrome users, paste
chrome://chrome/settings/cookies into your address bar and hit enter.
Firefox users, check this link out.
Once in there, look for cookies that pertains to the ROM you were using. In this case it was the Jr8 Custom ROM:
You want to paste the entire contents of the "name" to the XML field on this site and the entire contents of the "content" into the choices box on this site, like so:
Hit parse and the site will do the rest!
Coded by James. This site is in no way associated with MoDaCo.