The Tor Browser / file revision

 var timer; // Place timer in global scope to avoid it getting GC'ed prematurely

 function handleRequest(request, response)

 {

   response.setHeader("Cache-Control", "no-cache", false);

   response.setHeader("Content-Type", "text/html", false);

   response.write("<script src='file_bug568470-script.sjs'></script>");

   response.write("<div id='flushable'>");

   for (var i = 0; i < 2000; i++) { 

     response.write("Lorem ipsum dolor sit amet. ");

   }

   response.write("</div>");

   response.bodyOutputStream.flush();

   response.processAsync();

   timer = Components.classes["@mozilla.org/timer;1"]

     .createInstance(Components.interfaces.nsITimer);

   timer.initWithCallback(function() {

       response.finish();

     }, 1200, Components.interfaces.nsITimer.TYPE_ONE_SHOT);

 }