Firefox Stopped Playing Sounds

For some reason, Firefox now can’t seem to play any sounds. Yesterday I was streaming XMRadio all day just fine, and then when I booted up this morning…nothing. There is no sound from YouTube as well, but all video’s themselves do play. I tried under Chrome and everything works just fine.

I don’t remember seeing where there was an update yesterday that would have triggered this behavior, but I can’t say for sure…

Any idea’s?

Also, I wasn’t sure if I should post in this forum or Multimedia so if I should re-post over there, I will.

Where is the audio supposed to be coming from?
Through HDMI or from the built-in analog sound?

Sorry, I should have been more clear. The audio I am referencing are the speakers that are plugged into the onboard sound card.