I looked through the mailing list and found this:
http://aspn.activestate.com/ASPN/Mail/Message/pyxpcom/3490135
which led me to:
http://vamposdecampos.googlepages.com/pyxpcom

and I installed that on Firefox 3.0a8 on a Windows machine, Python
2.5.1 but it didn't end up working.
Has anybody been able to get this working?

This sounds like the solution I'm looking for though!  If it would work...
Mime Cuvalo