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.
Note: This problem seemed to resolve with iTunes 7.6.1.
Slash and company have to be kicking themselves for letting that jackass Rose get hold of the G n'R name and trademark. They could conceivably reform the entire original band and just get a new singer.