How to get access to Windows Registry form extension's JavaScript?

Hello!

I'm writing plugin for mozilla and firefox to provide some integration 
with our product Omea.
Omea is win32-only program, so plugin is useful only on Win32 platform.
I need to know: is Omea installed or not/ It could be checked by reading 
some predifinde windows registry value.
Is here any method (XPCOM component) to work with windows registry? I've 
searched throught www.xulplanet.com, but found only `nsIRegistry' interface 
without any documentation :(
Of course, I could write such component by myself, but I don't want to 
do so, because in such case I'll need to compile it exatly with same compiler, 


that was used for Mozilla/Firefox compilation, etc.

Lev Serebryakov
Programmer
JetBrains, Inc
http://www.jetbrains.com
"Develop with pleasure!"