// Make sure our timer stays alive.
let gTimer;

function handleRequest(request, response)
{
  response.setHeader("Content-Type", "text/css", false);
  response.setStatusLine("1.1", 200, "OK");
  response.processAsync();

  gTimer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
  // Wait for 1s before responding; this should usually make sure this load comes in last.
  gTimer.init(() => {
    // This sheet _does_ still get applied even though its importing link
    // overall reports failure...
    response.write("nosuchelement { background: red }");
    response.finish();
  }, 1000, Ci.nsITimer.TYPE_ONE_SHOT);
}