There seems to be an issue with Firefox 126.96.36.199 and iTunes 7.6 on OS X with regards to M3U files. I've noticed this issue with eMusic as well. To solve this, I've included the URL of the actual streams, and if you enter that URL in Advanced --> Open Stream, that should work. There's also this script, but I haven't had a chance to try it yet.
THE TOP SELLERS 1. Live At The Cellar Door (The W at Amazon) Neil Young (Reprise) 2. The Hobbit: The Desolation of Smaug: Original Motion Picture Soundtrack Special Edition [Soundtrack] [Special Edition] Howard Shore (WaterTower Music) 3.