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Ok, so I checked my extensions. Nothing there, but what I noticed is that if I have "Force dark pages" turned off, these bars disappear. I mean that removes the problem, but makes the feature almost useless to me. Which is quite sad because I really liked it. Maybe (as this feature is still in BETA) they could change it, so it doesnt have any white stripes in video players. Well thanks and have a great day 
Ok, so I checked my extensions. Nothing there, but what I noticed is that if I have "Force dark pages" turned off, these bars disappear. I mean that removes the problem, but makes the feature almost useless to me. Which is quite sad because I really liked it. Maybe (as this feature is still in BETA) they could change it, so it doesnt have any white stripes in video players. Well thanks and have a great day
While watching a YouTube-Video and I move my cursor so the time bar and everything shows up, there is also a white overlay that blocks vision to the video. For comparison, I have put an chrome and an opera image below: 
