The KQED audio player requires either Flash, which TenFourFox
has not supported since version 6, or MP3 HTML5 audio. Although
hopefully the browser can support MP3 audio in the future, right
now it doesn't, and probably won't for a while because we have to
write that support from scratch.
There may be an add-on to make this possible (I don't know of
one, though some downloader add-ons can help), but as it stands
right now you won't be able to listen to KQED with this browser,
nor anything else such as the PBS News Hour Ustream that requires
Flash. Sorry. You might have better luck with OmniWeb.
I can't get it to work, either. Neither in TenFourFox (with Web.m HTML5) nor in Safari on 10.5.8 (with Flash and H.264 HTML5). PBS states Flash + HTML5 as system requirements. Not sure why none of the options work.