Question: In my quest for knowledge I sometimes find myself scouring the source of a page only to find that the javascript method im looking for isnt on the page directly. That said I think it must be on one of the linked javascript pages. However I dont really want to have to look through each individual file to find the line. Is there a tool that can do this for me? 

Preferably in firefox as an add-on I was thinking...

Cheers,
Pete

Answer: 
Have you checked out [Firebug](http://getfirebug.com/)?
yes.. Firebug in Firefox | IE developer toolbar for IE | Developer toolbar for Firefox are great tools for indepth check of JS/CSS/HTML