"Object Browser" for XPCOM?

[Iwan van der Kleyn]

Little bit off topic perhaps. But does anyone know whether there is an
"Object Browser" available for XPCOM, Mozilla's cross-platform component
model? I want to do some research into PyXPCOM, ActiveState's bindings
between Python and XPCOM. An Object Browser like you will find in the IDE of
Visual Basic, makes it more easy to explore the interfaces which are
available on a system.

Regards,

Iwan