Hypothetical: I find a page with a button (\'#bigButton\'), that when clicked causes a llama (\'img#theLlama\') to show() using jQuery.
So, somewhere (say, Line 76) in
Given the interface you're after, I think you'll want FireQuery: http://firequery.binaryage.com/
It's a Firebug addon specifically for areas like this (a jQuery specific addon, strong in data/events).