diff -r 000000000000 -r 6474c204b198 content/base/test/script_bug602838.sjs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/test/script_bug602838.sjs	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+function setOurState(data) {
+  x = { data: data, QueryInterface: function(iid) { return this } };
+  x.wrappedJSObject = x;
+  setObjectState("bug602838", x);
+}
+
+function getOurState() {
+  var data;
+  getObjectState("bug602838", function(x) {
+    // x can be null if no one has set any state yet
+    if (x) {
+      data = x.wrappedJSObject.data;
+    }
+  });
+  return data;
+}
+
+function handleRequest(request, response)
+{
+  if (request.queryString) {
+    let blockedResponse = getOurState();
+    if (typeof(blockedResponse) == "object") {
+      blockedResponse.finish();
+      setOurState(null);
+    } else {
+      setOurState("unblocked");
+    }
+    return;
+  }
+  response.setHeader("Cache-Control", "no-cache", false);
+  response.setHeader("Content-Type", "text/javascript", false);
+  response.write("ok(asyncRan, 'Async script should have run first.'); firstRan = true;");
+  if (getOurState() != "unblocked") {
+    response.processAsync();
+    setOurState(response);
+  }
+}