What is the best way to debug with a browser

Hi,

I would like to see if I could fix konqueror (KDE browser) for this cool FCKeditor. I'm not sure yet if either IE or Gecko way would be best to support, though konqueror defaults mostly to IE. But first I try to most easiest I think.
What I'm missing in the tar file are non-optimized javascripts files. There is the _sources directory, but how do I create the js files out of these w/o putting everything on a single line (which obviously makes it very hard to debug)?
Any other help, links are welcome of course.

Regards,

Koos