In developing the XM Radio Online player, we came across a pretty big issue that made it impossible to use the windows media player in Firefox and Safari. Well, we are also developing the same player for Windows Media Center edition and came across the same problem.
So after finally finding a workaround, we realized very quickly that it was also a fix for the Firefox/Safari issues we were having.
So, starting today, you can listen to XM Radio Online using Firefox or Safari on your mac. Go sign up for the free 3 day trial and check it out.