Hey switching off flash player is no solution because im using youtube a lot and html 5 only let me watch 720p max.. Thats why i use the addon "force html 5 to use flash player" Is there another solution? Thanks for your help
you can use the addon "flash-disable". With this addon you can deactivate flash with one click. it is only necessary to reload the page. when you switch to youtube push the button again and flash is active again.