kmathern wrote:In about:plugins is any other plugin (other than "VLC Web Plugin") shown for mp3?
M12 might have come with some other plugin preinstalled, but I don't recall what it was.
No, the VLC plugin is the only one that names mp3s.
From the comments that everyone seems to be able to play the link, I am starting to think I might have, at some point, removed something (a library perhaps) that caused this mess. I would guess this happened when I upgraded my iceweasel, but can't be sure.
@JBoman, how can I check whether the issue is conflicting plugins? Just trial and error?