trouble with firefox reading my update.rdf

Hello, I'm trying to make an update.rdf file for my extension, but when
I try and look at my rdf file in firefox, firefox doesn't recognize it
as an rdf file...in other words instead of looking nicely formatted
like the other rdfs i've seen, it looks like a jumble of words at the
top of the screen.  at first I thought I'd written the file wrong, but
IE seems to be able to open it fine...  any ideas as to what may be
going wrong?


thanks!