Simple XPConnect Example Wanted

[Patrick McHale]

Is there out there a simple example that compiles and runs - that shows
exactly what is minimally needed to get access to C++ code from Javascript.
All the examples I have come across have a lot of bells and whistles added
in which confuse things. I would be very grateful if anyone knows of an
example that does not create a window - but simple and can be implemented in
C++ code to add XPConnect functionality.

Patrick McHale