Chrome is Your New Best Friend
Google's chrome developer tools has many bells and whistles, some of which I've only discovered in the last week. One feature that I think is worthy of mention is the pretty print button, tucked away at the bottom of the page in the status bar.
Click on the button and dojo.js goes from this:
Some of the variables are still compressed, but now the code becomes legible and breakpoints can be added with ease.
Yes, it also works with JQuery.