ColorRun – Simple browser game about colors

  function action(){
    var opacity1 = $('#color-1')[0].getContext('2d').getImageData(0,0,1,1).data[3];
    var opacity2 = $('#color-2')[0].getContext('2d').getImageData(0,0,1,1).data[3];
    if(opacity1 > opacity2){
      $('#color-1').trigger('click');
    }else{
      $('#color-2').trigger('click');
    } 
  };

  setInterval('action()', 100);

  function action(){
    if($('#color-1').css('opacity') > $('#color-2').css('opacity')){
      $('#color-1').trigger('click');
    }else{
      $('#color-2').trigger('click');
    } 
  };

  setInterval('action()',0);

Is there a better way to figure out if a game is trying to hijack my history?

Minor: In the gameover pop-up the social buttons only show the facebook logo, though the links point to fb/twitter/plus