У вашего броузера проблема в совместимости с HTML5
Some of my steam games kept freezing and crashing during a few different points in the game and once in a while this would cause the game to become stuck. I have found a solution to that problem by verifying the integrity of the game cache. This video shows you how to do that and may help solve some of the issues you may be having with one or more of your games.
I hope everyone finds this vide helpful. Feel free to leave feedback and maybe tell me what else you would like to see.