Using XMLHTTPRequest within Firefox (Newbie)

Hi

I use MSXML.XMLHTTPRequest in an Excel VBA routine to download info from
a web page using responseText.

I'd like to swap over from IE & use Firefox instead. Is this possible?
I looked for a Mozilla object library but couldn't see one. Would I have
to load it manually?

I've done some basic Google searching but unearthed nothing to get me
started.

Please point me in the right direction.

Thanks

Dave F.