diff -r 000000000000 -r 6474c204b198 dom/indexedDB/test/unit/test_transaction_lifetimes_nested.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/indexedDB/test/unit/test_transaction_lifetimes_nested.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,50 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+var testGenerator = testSteps();
+
+function testSteps()
+{
+  let request = indexedDB.open(this.window ? window.location.pathname : "Splendid Test", 1);
+  request.onerror = errorHandler;
+  request.onupgradeneeded = grabEventAndContinueHandler;
+  let event = yield undefined;
+
+  let db = event.target.result;
+  db.onerror = errorHandler;
+
+  event.target.onsuccess = continueToNextStep;
+  db.createObjectStore("foo");
+  yield undefined;
+
+  let transaction1 = db.transaction("foo");
+
+  let transaction2;
+
+  let comp = this.window ? SpecialPowers.wrap(Components) : Components;
+  let thread = comp.classes["@mozilla.org/thread-manager;1"]
+                   .getService(comp.interfaces.nsIThreadManager)
+                   .currentThread;
+
+  let eventHasRun;
+
+  thread.dispatch(function() {
+    eventHasRun = true;
+
+    transaction2 = db.transaction("foo");
+  }, Components.interfaces.nsIThread.DISPATCH_NORMAL);
+
+  while (!eventHasRun) {
+    thread.processNextEvent(false);
+  }
+
+  ok(transaction2, "Non-null transaction2");
+
+  continueToNextStep();
+  yield undefined;
+
+  finishTest();
+  yield undefined;
+}