Debugging Javascript generated on the fly whre there is no stored Javascript file.

My database system, ERROS, generates HTML and Javascript on the fly, in
response to user requests. It has worked well for some time, but I have
found a way of operating it that results in a variable value being changed
when it should not. Users would not be aware of this method of operation
but I want to fix it and make the method generally available. When I go
into debugging tools in Chrome, I can see my source code, but when I click
on sources it demands that I hit Ctl+P to open a file. But there is no file
to open. I tried saving my source code as a file, but when I press Ctl+P I
cannot get access to any files on my PC nor can I see a way to access the
IFS if I saved my file there. I don't know whether the problem is on the
server or in the browser code. Is there a way of debugging my virtual code?

Many thanks

Rob Dixon