Nope it's working fine. Galaxy S3 with Android 4.1.2 JellyBean.
Hmmm. Galaxy S2 / Ice cream sandwich / Firefox, and it's had that default since I got it. Of course, I can change it once I've started, but it's an odd default.
I'll try via Chrome.
Aha! Via Chrome it's OK, and a fresh entry into FF is also OK. I have forums as one of my Top Sites, and when I go from there into Search, that's when I'm getting audio only, which is strange, as I seldom go into audio files, and have never searched on them, or even clicked on one from my phone. Ah well.
Thanks!