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YouTube only shows grety boxes

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Latest version of FireFox for MacOS on Sonoma 14.7.1. When I go to YouTube it just shows greyed out boxes. When using private mode, it works fine.

I've tried clearing cache, switching off AdBlock, etc.

YouTube works fine on other browsers.

Any suggestions?

Latest version of FireFox for MacOS on Sonoma 14.7.1. When I go to YouTube it just shows greyed out boxes. When using private mode, it works fine. I've tried clearing cache, switching off AdBlock, etc. YouTube works fine on other browsers. Any suggestions?
Attached screenshots

Modified by Christopher Saul

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