I'm currently experiencing difficulties with the Twitch video player. After typing a message of a certain length, between 3-4 lines, the video player starts moving back and forth in time with the cursor and stops when the cursor stops. I have no idea what causes it. I've turned off all my addons, reset Firefox, and messed around with settings. the only thing that stops it is running troubleshoot mode, but i don't know what is being changed to fix the issue.