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.
How's your month been? Me, I've been keeping busy. My girlfriend and I bought a house and we both moved into it (albeit several weeks apart). I've also had three out-of-province trips, and I've put in a ton of overtime at work.