Take a look at the files in a normal install of K-Meleon. There is one kmeleon.exe and a few dll's in the kplugins directory; That's K-Meleon! The rest (more or less) is Mozilla/Gecko/GRE. And about 50% of what's inside the kmeleon.exe is code "borrowed" from mfcEmded.exe (the official test application for embedding Mozilla on Windows).
All bugs that might be dependent on Mozilla/Gecko components ought to be tested against mfcEmbed before reported to K-Meleon BTS. Things that work in mfcEmbed but not in K-Meleon are our fault. Things that don't work in Mozilla are clearly Mozilla bugs, and things that work in Mozilla but not in mfcEmbed are bugs with the embedding of Gecko.
As a rule of thumb:
You can download the latest mfcembed for testing.
There are several bugs marked as Mozilla Bug, but without a link to a bug in bugzilla. We need help finding/filing bugzilla bugs as well as finding bugs reported in K-Meleon that depend on Mozilla features.