I closed safari and tried it again and now it actually worked better. So now I could compare it better to the downloaded video's First thing is that indeed the colors are now a bit oversaturated and the contrast is too high I think. It becomes very noticeable when you stop the 3d player and it returns to the 2d image, the colors look quite different. However compared to how it was before, it's MUCH better of course!
I also still see some framerate issue's, it's just not as smooth as it should be.
I think though that the main reason for me not to use it is the menu continually popping up. That kind of makes it unusable. So for now, will continue to download and stream via Moonplayer