Just checked one of my bookmarked CDBaby tracks. Worked OK. I have Firefox version 2.0.0.20 on a Mac (OS 10.3.9). Carried over the bookmarks from Safari and probably haven't used that link since.
After my email service was "upgraded" to the point where Safari couldn't handle it, I checked out and installed several browsers, so I now have Safari, Firefox, Camino and Opera. If I can't access something on Firefox, I try one of the others. All of these probably have later versions by now, but until I upgrsde the Mac OS, I'm stuck with what I've got.
I presume the format of the download files is MP3