Well, that's an IE/Win only thing, hence why you can't see it on your mac. You won't be able to see it on Moz for Win either, I would imagine.
You're using an XML data island, which can work with Moz, but it's not as easy as with IE/Win (look at the whole recordset part of the code - recordset is something used all over MS things (VB etc), so this won't be a standard, I'd imagine, hence why it isn't being used in any other browser).
You could do what you want with XSLT or even some XML DOM parsing, but it won't be as simple as the way MS has provided in it's data island method.
Oh, btw, if you want to get data islands working in IE6 and Moz, see
here