Tracking when / where a variable is set in Javascript using FireBug

Question

I am currently using FireBug to see how hypem delivers it the content to allow its flash player to work (specifically the play button functionality). I have found that the trackList variable is populated with the data but I do not know where it is set.

How can I track when / where this collection is modified? I can add a watch to it but don't know how to trap when it is set.

FYI I am doing this as I want some of this functionality and want to understand how they have done this.

Answer 1

Unfortunately, this isn't directly possible.

Instead, you can search through the Javascript and see where the variable is set, then put a normal breakpoint on each line that you find.