On YouTube webpage, instead of the video thumbnail images, I see only a blue box with a question mark in it. Any video on YouTube does not seems to work either. Can anyone help me? I am not able to find a proper way to solve this error.
Last action performed before encountering the issue: Installing Unity 2018.3 (it is working fine)
I have a mid 2010 13" MacBook Pro running macOS High Sierra 10.13.6