diff -r 000000000000 -r 6474c204b198 dom/browser-element/mochitest/browserElement_DocumentFirstPaint.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/browser-element/mochitest/browserElement_DocumentFirstPaint.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,70 @@
+/* Any copyright is dedicated to the public domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Bug 829486 - Add mozdocumentbrowserfirstpaint event.
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+browserElementTestHelpers.setEnabledPref(true);
+browserElementTestHelpers.addPermission();
+
+var iframe;
+
+function runTestQueue(queue) {
+  if (queue.length == 0) {
+    SimpleTest.finish();
+    return;
+  }
+
+  var gotFirstPaint = false;
+  var gotFirstLocationChange = false;
+  var test = queue.shift();
+
+  function runNext() {
+    iframe.removeEventListener('mozbrowserdocumentfirstpaint', documentfirstpainthandler);
+    iframe.removeEventListener('mozbrowserloadend', loadendhandler);
+    runTestQueue(queue);
+  }
+
+  function documentfirstpainthandler(e) {
+    ok(!gotFirstPaint, "Got firstpaint only once");
+    gotFirstPaint = true;
+    if (gotFirstLocationChange) {
+      runNext();
+    }
+  }
+
+  function loadendhandler(e) {
+    gotFirstLocationChange = true;
+    if (gotFirstPaint) {
+      runNext();
+    }
+  }
+
+  iframe.addEventListener('mozbrowserdocumentfirstpaint', documentfirstpainthandler);
+  iframe.addEventListener('mozbrowserloadend', loadendhandler);
+
+  test();
+}
+
+function testChangeLocation() {
+  iframe.src = browserElementTestHelpers.emptyPage1 + "?2";
+}
+
+function testReload() {
+  iframe.reload();
+}
+
+function testFirstLoad() {
+  document.body.appendChild(iframe);
+  iframe.src = browserElementTestHelpers.emptyPage1;
+}
+
+function runTest() {
+  iframe = document.createElement('iframe');
+  SpecialPowers.wrap(iframe).mozbrowser = true;
+
+  runTestQueue([testFirstLoad, testReload, testChangeLocation]);
+}
+
+addEventListener('testready', runTest);