Using Java Xpcom to notify events

Hi

i am trying to create a firefox extention that communicate
informations about navigation to a graph navigator (developped with
java) which discribe browser navigation using graph. the problem is
that javascrip  don't provide possibility to communicate those
informations, so i thought to use java xpcom to resolve the problem,
but i don't know how to use it exactly, my problem is why can i notify
events (mouse clicks and links access) to my application.

thank you.