Fizbanic, some possibilities to consider.

1. Is the Firefox tab muted? If you right-click on the tab header at the top of the screen, is there an "Unmute Tab" option?

2. What happens if you press the mute / unmute button within a video player?

3. Could Firefox be muted in your OS volume settings? I know that in Windows you can mute individual applications within the Windows settings, so wonder if this has happened in your OS?

Thanks for the reply.

1. No tab was not muted and I did mute/unmute just in case now to try anything.

2. see above.

3. The mute of individual application would be and can be done through volume mixer and no it is not muted.

The only thing I did was update windows, I was watching a video and it was fine and I was going to make dinner so I figured I would update and restart so every thing should have been exactly the same as before the restart.

The only thing that changed was the update.

Fizbanic, just to clarify, did you check Windows own volume mixer settings, rather than a 3rd party application's mixer? And was Firefox running when you went there?

Yes, I right click on the speaker icon in the lower right, and went to the mixer there. As it is windows I will only deal with that.

However I fail to see how that can be an issue when all other programs, games, applications work except Firefox.

As you can see from the screen grab nothing is muted.

Again everything was working fine, I do an update and bam it no longer works in Firefox only!

Fizbanic, some more thoughts.

Have you rebooted the computer since discovering the issue?

Is Firefox still muted with normal speakers (if you have any besides the headphones)?

Perhaps you could try muting Firefox in the Windows settings, play a video that would normally produce sound, then unmute Firefox?