Ok some more info. Upon closing and reopening, where there is no audio, it does not say "playing" on the tab itself. Changing the video quality settings also fixes this issue. I have no idea what is causing this.

Is this a new issue? Does it still happen if you disable low latency mode in Twitch (Settings > Advanced > Low Latency)?

Is this a new issue? Does it still happen if you disable low latency mode in Twitch (Settings > Advanced > Low Latency)?

This does indeed appear to a new issue. I dont believe this happened before in my many years of using Firefox. And this does sort of solve the issue. If I open a stream, then close the browser and reopen using restore last session, the audio does indeed stay muted, with and without low latency. However, turning low latency off and on does restore the audio, much like changing the video quality does. If I had to maybe guess what the issue is, when watching a video for example, it says "PLAYING" in the tab at the top of the browser. When restoring, it does not say that for the stream, until changing quality or latency. And Im not sure if this is related, but turning the audio on and off for youtube videos and twitch streams causing minor frame drops.

Does it still happen in Troubleshoot Mode?

Does it still happen in Troubleshoot Mode?

Yes, the problem still occurs in Troubleshoot mode.

Does it still happen in a new profile? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile.

Does it still happen in a new profile? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile.

Mostly not, no. After downloading Developer edition, the issue is more infrequent, but does still occur. However, developer edition does provide the "click to unmute" option, which normal firefox does not. But, developer edition does also just have random mutes where I am forced to change the quality or etc to hear sound again.

Did you check for issues caused by your Avast Antivirus security software ?

Did you check for issues caused by your Avast Antivirus security software ?

I assume by this, you mean that I should disable my Avast and see if the problem persists? Edit: After turning off the core shields it provides, the issue remains. As the picture shows, no sound is coming from the twitch tab at the top.

Disabling anti-virus might not be enough to stop it from interfering. Some more things to try:

• Go to about:third-party and disable third-party modules.
• Start in Windows Safe Mode.
• Uninstall Avast temporarily and reboot the system.

After going on to third party and disabling all avast modules that connect to Firefox, the issue persists. As the picture shows, no sound is coming from the twitch tab. And yes, it was unmuted, but still no sound.