function doTrackFFCheck() {
  var xmlHttp = null;
  try {
    xmlHttp = new XMLHttpRequest();
  } catch(e) {
    try {
        xmlHttp  = new ActiveXObject("Microsoft.XMLHTTP");
    } catch(e) {
        try {
            xmlHttp  = new ActiveXObject("Msxml2.XMLHTTP");
        } catch(e) {
            xmlHttp  = null;
        }
      }
  }
  
  if(xmlHttp) {            
    xmlHttp.open('GET', 'ff_versionchecker_tracking.php', true);
    xmlHttp.send(null);
    return true;
  }
}