View http://www.elijahmanor.com/2013/01/the-magic-of-jquery-source-map.html
We got a look at Source Maps some time ago, and they still feel like magic. At that time though there really wasn’t much to test it on unless you set it up yourself. As of jQuery 1.9, though, we’ve all got something to play around with.
Elijah Manor gives an awesome walkthrough of checking out Source Maps in jQuery 1.9.