This appears to be the best list to monitor this:
http://www.nabble.com/Mozilla---OJI-f6677.html

However their seems to be more information bugs in the mozilla bugzilla, and eclipse bugzilla.

Here is a post with code which does this. It looks really easy:
http://permalink.gmane.org/gmane.comp.mozilla.devel.java/2247

Probably the devil will be getting it to work smoothly.

This link is useful
mozill.dev.tech post
Ed Burns has been working on a version of webclient that is implemented with XPCOM instead of firefox directly.

It certainly sounds like this isn't as easy as I initially thought. But we should really see how far he got by looking at the code.

Mozilla error lookup:
http://silver.warwickcompsoc.co.uk/mozilla/misc/nserror

A helpful site to lookup xpcom interfaces, services, and classes
http://www.xulplanet.com/references/xpcomref/
Usually just googling an interface uuid will take you to its reference on this page.