如何通过压缩的javascript文件进行调试?

I'm using django-compress to shrink my javascript files. However, I am now having trouble debugging through it because everything is squished. I believe stackoverflow use some kind of js compression too. How do you go about to debug through your javascript on the live site or on your dev machine with the code well formatted? Firebug has all the code in one line which makes it hard to dig through.I'm using django-compress to shrink my javascri