hi choppbobby, please see if the following article can help you: What to do if Firefox won't play any sounds

This does not solve my problem.

I have audio in everything except You Tube in Fire Fox. 
I can play audio in WMP, music from a CD,and audio in IE.
Bob

Does Firefox use the Shockwave Flash plugin or the HTML5 media player to play the files?

The Flash player will give a Flash context menu if you right-click the player area.

I have no idea what FF uses for audio.

Bob

The thing that is confusing is that this just started a few days ago.Before that I had no problem.

It worked before without any Add Ons,and there is no problem when I use IE.

I went to You Tube and opened a video.

At the bottom of the video window there is a speaker icon. The audio was muted. I clicked on the icon which canceled the muting, and now I have audio with You Tube.
Bob

FF 36.0.4 just started blocking my sound card (sound for less than a sec. before it cuts out, no mute signs,.) IE works fine look IE looks not as good as FF when it plays a video clip.

I had to uninstall FF 36.0.1 because it crashed non-stop. Even crashing W 7 at times. And blocked most video clips What is going on? Should I just stick with FF 35? I am used to Flash being a pain, but this is nuts.

info: W 7 pro, behringer USB WDM audio 2.8.40 and NVIDIA graphics.

You can try to disable WebRTC by toggling this pref to false on the about:config page if you aren't using Hello.

• loop.enabled = false

• https://support.mozilla.org/kb/firefox-hello-make-receive-calls-without-account

cor-el said

You can try to disable WebRTC by toggling this pref to false on the about:config page if you aren't using Hello.

• loop.enabled = false

• https://support.mozilla.org/kb/firefox-hello-make-receive-calls-without-account

WebRTC? What is it?

And what does This calling with Hello have to do with all audio FF from sources like Youtube, BBC, etc? I will likely never use Hello because it sounds like Google Hangouts, an enormeous flop, whereas Gtalk/Gvoice was great because it meant no more endless ridiculous menus to cell phone messages.