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I had the same problem and also hated it. I'm using the 'force dark pages' option which causes the white overlay. There are a few ways to fix it: 1. Enable the 'Dark theme' that is native to Youtube or 2. install the 'Enhancer for YouTube' plugin and choose one of it's dark themes. Problem solved! 
I had the same problem and also hated it. I'm using the 'force dark pages' option which causes the white overlay. There are a few ways to fix it: 1. Enable the 'Dark theme' that is native to Youtube or 2. install the 'Enhancer for YouTube' plugin and choose one of it's dark themes. Problem solved!