EDIT: The question has been updated, since I now know what the cause is. Hello, after https://www.twitch.tv/ got an update and it uses the Highwind Player for the videos, the arrow keys don't work. By pressing left or right arrow key, the video doesn't move 5 seconds back or forward, however, pressing "J" and "L" does move the video back and forward ("K" pauses/plays the video), pressing up or down doesn't change the volume. Starting Firefox in private browsing or using Edge however, the arrow keys work normally, rewinding or forwarding the video and increasing/decreasing sound. The contrary is also true, J,K,L only work with normal Frefox, but don't do anything on private browser or other borwsers. My question is, since the private browsing is still using the standard player, is there any way I can force the standard Firefox to use the normal player instead of the Highwind Player? Thank you.