The Tor Browser / file revision

 function handleRequest(request, response)

 {

   var self = Components.classes["@mozilla.org/file/local;1"]

                        .createInstance(Components.interfaces.nsILocalFile);

   self.initWithPath(getState("__LOCATION__"));

   var dest = self.parent;

   dest.append("\u263a.ico");

   if (dest.exists())

     dest.remove(false);

   var src = self.parent;

   src.append("bug415761.ico");

   src.copyTo(null, dest.leafName);

   var uri = Components.classes["@mozilla.org/network/io-service;1"]

                       .getService(Components.interfaces.nsIIOService)

                       .newFileURI(dest).spec;

   response.setStatusLine(request.httpVersion, 200, "OK");

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

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

   response.write("<link rel=\"stylesheet\" href=\"ImageDocument.css\">");

   response.write("<img src=\"moz-icon:" + uri + "\" width=\"32\" height=\"32\">");

 }