var FX_DOWNLOADS = 1316624751;
 var FX_CHANGE = 0.29811;
 var FX_RUNS = 0;

 setInterval(update_firefox_download,1000);

 function update_firefox_download(){
  var firefox_box = document.getElementById('firefox-downloads');
  if(firefox_box){
   firefox_box.innerHTML = Math.round(FX_DOWNLOADS + (FX_CHANGE*FX_RUNS));
  }
  FX_RUNS++;
 }

 update_firefox_download();