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YouTube Vids wont play on FireFox, even in Safe Mode

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Hello, My problem is when I did the lastest FireFox update on 11/21/20, YouTube video's will not play on FireFox, even with the accelerated hardware un-checked, and even in Safe Mode. However - YouTube "does" work just fine on Google Chrome.

My system: MBP, High Sierra, using FireFox version: 83.0 (64-bit). What Ive done so far: Ive shut off the ad-blocker, the accelerated hardware is always off, went into Safe Mode and still the vids wont play. YouTube video's play perfectly fine in Google Chrome.

FireFox: I can watch movies on Amazon Prime with no problems. Its just a YouTube problem.

Thanks very much for your sage advice.