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Win11, just installed FireFox update, youtube videos do not play, no error message

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FireFox updated to 136.0 (64bit), running on Winders11. Youtube does not play video. No error messages. no audio no video no buttons to click on to start. I really need to get this running. Your help is much appreciated. Thanks Stan W8SRD

FireFox updated to 136.0 (64bit), running on Winders11. Youtube does not play video. No error messages. no audio no video no buttons to click on to start. I really need to get this running. Your help is much appreciated. Thanks Stan W8SRD
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Some icons on your toolbar look like content blockers. Could you experiment with making some site exceptions to see whether videos play? Ads might also play, but let's see whether we can get anything to happen there.

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