You will need to enable the flash plugin in Safari by doing the following:Īfter that you will need to choose Security, and then tick 'enable plugins'. There are a number of ways that you can use to fix this issue. This problem mostly occurs when you are using the HTML5 version player and not the classic player version.
You can also experience the YouTube fullscreen not working when you are using Safari. #2: YouTube Fullscreen Not Working on Safari
