function handleRequest(request, response) { response.processAsync(); response.setHeader("Content-Type", "text/plain", false); for (var i = 0; i < 1000; ++i) response.write("Hello... "); var timer = Components.classes["@mozilla.org/timer;1"] .createInstance(Components.interfaces.nsITimer); timer.initWithCallback(function() { response.write("world.\n"); response.finish(); }, 10 * 1000 /* 10 secs */, Components.interfaces.nsITimer.TYPE_ONE_SHOT); }