JavaXPCOM questions

Hi all,

I was reading up the documentation on JavaXPCOM on the MDC and had a
couple of questions. I searched all over the web and the documentation
is pretty sparse - it would help me out a lot if you could share your
expertise.

I have a requirement where I need to access Java through a Firefox
extension. I know I can do this through LiveConnect, but I want see if
I can manipulate the DOM directly in Java, not JS. Can JavaXPCOM help
me do this? If not, could you let me know what other options I have?

I had another question regarding embedding of the Mozilla GUI in my
Java app through JavaXPCOM. Does this mean that I have to create a
complete browser experience using XUL and embed that in my app?

Sorry if I sound a little confused - I am.

Thanks all for your help.
Sanjeev