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No sound on any website 66.0.3, Linux

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No sound on Firefox. Sound ok on other apps. I have tried the troubleshooting suggestions and disabled plugins, cleared cache, refreshed Firefox, re-installed, installed flash. Any suggestions much appreciated. Using Chrome which works fine, but would like to switch back to Firefox.

No sound on Firefox. Sound ok on other apps. I have tried the troubleshooting suggestions and disabled plugins, cleared cache, refreshed Firefox, re-installed, installed flash. Any suggestions much appreciated. Using Chrome which works fine, but would like to switch back to Firefox.

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Same issue with 66.0.4

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Firefox uses PulseAudio since Firefox 46.0 and later as 45.0 and earlier used ALSA.

It may be possible that audio is getting muted on your system. When I use say TVtime to watch Tv in a window and then close it, it sometimes mutes the volume of system and I have to unmute it.

Also make sure the volume on youtube html5 player is not muted or low. You may likely have checked this already.

There is a possibility of trying to use apulse if you do not want to make use of PulseAudio.

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It was all working up until a few days ago when I suspect the Firefox 66.0.3 update occurred. I have attached the pulseaudio info. Not sure if it looks ok though. https://pastebin.com/uC4ccNYe