Suggestions for running Mochitests on Thunderbird

I am currently making some initial investigations into running 
mochitests on Thunderbird.

I'm not too worried if the core tests don't/won't run (e.g. they will 
eventually be covered by xulrunner automated testing), but we really do 
need mochitests for the MailNews specific items.

The main problem here, of course, is that we haven't got a browser 
window when we start up.

I've tracked down one problem (not starting up at all) to the http url 
on the command line, obviously we'll need that, or a way of handling it.

One thought I've had is to provide a test-only command line handler that 
could handle '-test' or even the http url, which would then do something 
special on starting TB - is it feasable to create a browser window somehow?

Any thoughts would be very much apprechiated.

Standard8