Maybe someone enjoyed playing the most in his own way. I don't think we should insist that he's ruining something in this case. I think audio controls should not present in the design if the runtime of the game has these controls. I searched how to mute tabs in browser and I got what I need so you don't have to do anything.
Thanks! Great that it is browser feature ;) When my designs of my other games allow it in the future i will sure add those controls myself. The next game i am making will have these controls as i already know where to place them. But i am just in doubt about this one, maybe i will also place them somewhere eventually...