accessing web services with Mozilla (WSDL proxying), some questions

Following samples and all at http://www.mozilla.org/projects/webservices/ I
finally got my web service consumed in Mozilla 1.7.7 :-) A web services
client implementation within the web browser, pretty cool stuff IMHO! In
conjunction with LiveConnect (access functionality implemented in Java) nice
things can be done, all within the HTML/JavaScript page itself :-)

Now I tried my sample from Firefox (1.0). Just get "failure loading". I have
not investigated yet what exactly happens, just want to make sure: could it
be, that the "Mozilla web services implementation" is NOT available in
Firefox???

Then it seems I do not need this "web-scripts-access.xml" to put in my web
server's doc root. But maybe this is only due to the fact that my URL is
something like "..localhost..".

The asynchronous programming technique is, let's say, interesting. :-) Is
there a synchronous way planned? And will this web services implementation
be "supported" in the future or is the project dead?

BTW: I tried to build my HTML/JavaScript stuff in a way that both Mozilla
and IE (web services behaviour) could be used as clients. Well, the IE stuff
seems to be in a unuseable state, I couldn't manage to get simplest WSDL
processed by the beast. I think they hard-coded some namespace stuff there
which is obviously only working against .NET or so.

Thanx
   Merten