How to debug JS when using XSLT with a bunch of frames?

Question

JavaScript

There is an xsl template and there is xml data. All this is given to Oracle-Application-Server-10g. I don't understand how you can debug JS in this case. He swears, throws errors, but throws links to an xml file, in which, of course, there is not even a JS code. It adds fuel to the fire that I counted 53 frames in the application in working condition, each with its own context and, maybe, JS code. It is not at all clear in what context what is being executed and how can it be debugged? I am generally silent about the backend. Help ='(