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Videos & Movies won't Play

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Hi, After the latest Windows 10 Home (pack120.2212.31.0) & Firefox (81.0.2 64bit) updates (15 Oct 20) Movies & Video clips (eg. in news websites etc) won't run. Video clips result in a "MEDIA_ERR_UNKNOWN" error. I have WebRTC disabled & also run a VPN. With WebRTC enabled I can get the Movies to play, however the video clips still won't play. I don't have any issues in my Chrome browser, using the same VPN & WebRTC apps. Firefox has been uninstalled & reinstalled to no avail. Everything was working fine till the updates. Any ideas on how to get my video clips & also my Movies to run in Firefox?

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