Well, here's a copy of my /usr/local/bin/xmms (which Mark L. supplied to me a while ago, he rocks). Works just fine w/ Netscape

I'm sure that works fine. I think Hijack is spitting out the headers just fine as well. The only problem is that when I go and attempt to and start the stream, mozilla goes into a loop and just tries to run the helper application and never finishes (same mime type I created for Netscape). Could it be Mozilla is more picky than Netscape with the content headers?