Thank you. I solved the problem myself: signed out of Pandora, closed the web browser, rebooted my system, opened Pandora web page, and voila! the volume is back.
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No solution has been given for Microsoft Edge. There used to be a volume control icon next to the P on the web tab; I might have used that to mute, but the icon does not display now, so cannot unmute it. Please advise.
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