[gb2world]

Is there an app or mod or any way in Firebug to locate the parent file? The coding isn't so much a problem as just finding out where the #$%! it is

Yes - the tool is Webmastermode - it makes clear what is controlled by language variables and also shows what templates were used to build the various sections of html code. It also tells you what smarty variables are available to you on a particular page, and what those smarty variables are set to. It will be just as important to you as Firebug when making changes to your X-cart site.