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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1096146
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1096146</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body onload="runTests();">
+<a target="_blank"
+   href="https://bugzilla.mozilla.org/show_bug.cgi?id=1096146">Mozilla Bug 1096146</a>
+<div id="content" style="display: none;">
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+const kKeydownEvent = 0x1;
+const kScrollEvent  = 0x2;
+
+var gCurrentTest = 0;
+var gNumEvents = 0;
+var kTests = [
+  {
+    description: "no preventDefault at 'mozbrowserbeforekeydown'",
+    expectedEvents: kKeydownEvent | kScrollEvent,
+    resultEvents: 0x0,
+    doPreventDefault: false
+  },
+  {
+    description: "do preventDefault at 'mozbrowserbeforekeydown'",
+    expectedEvents: 0x0,
+    resultEvents: 0x0,
+    doPreventDefault: true
+  }
+]
+
+function frameScript()
+{
+  function handler(e) {
+    sendSyncMessage("forwardevent", { type: e.type });
+  }
+  addEventListener('keydown', handler);
+  addEventListener('scroll', handler);
+}
+
+
+function waitAndVerifyResult(count) {
+  if (gNumEvents >= 3 || count > 10) {
+    is(kTests[gCurrentTest].resultEvents,
+       kTests[gCurrentTest].expectedEvents,
+       "verify result");
+    runTests();
+	} else {
+    SimpleTest.requestFlakyTimeout("We must delay to wait for scroll/keydown events.");
+    setTimeout(() => waitAndVerifyResult(count + 1), 100);
+  }
+}
+
+function testDefaultAction()
+{
+  synthesizeKey('VK_END', {}, document.getElementById("embedded").contentWindow);
+  waitAndVerifyResult(0);
+}
+
+function prepareTest()
+{
+  gNumEvents = 0;
+
+  var handler;
+  if (kTests[gCurrentTest].doPreventDefault) {
+    handler = preventDefaultHandler;
+  } else {
+    handler = noPreventDefaultHandler;
+  }
+  window.addEventListener("mozbrowserbeforekeydown", handler);
+
+  var iframe = document.createElement("iframe");
+  iframe.id = "embedded";
+  iframe.src = "bug1096146_embedded.html";
+  iframe.setAttribute("remote", "false");
+  SpecialPowers.wrap(iframe).mozbrowser = true;
+
+  iframe.addEventListener("mozbrowserloadend", function onloadend() {
+    iframe.removeEventListener("mozbrowserloadend", onloadend);
+    iframe.focus();
+    var mm = SpecialPowers.getBrowserFrameMessageManager(iframe);
+    mm.addMessageListener("forwardevent", function(msg) {
+      var value = 0;
+      switch(msg.json.type) {
+        case "scroll":
+          ++gNumEvents;
+          value = kScrollEvent;
+          break;
+        case "keydown":
+          ++gNumEvents;
+          value = kKeydownEvent;
+          break;
+        default:
+          ok(false, "unexpected event");
+      }
+
+      kTests[gCurrentTest].resultEvents =
+        kTests[gCurrentTest].resultEvents | value;
+    });
+    mm.loadFrameScript("data:,(" + frameScript.toString() + ")();", false);
+    runTests();
+    return;
+  });
+
+  document.body.appendChild(iframe);
+}
+
+function preventDefaultHandler(evt)
+{
+  ok(true, "receive " + evt.type + " and do preventDefault.");
+	++gNumEvents;
+  evt.preventDefault();
+}
+
+function noPreventDefaultHandler(evt)
+{
+  ok(true, "receive " + evt.type + ".");
+	++gNumEvents;
+}
+
+function teardownHandler()
+{
+  var handler;
+  if (kTests[gCurrentTest].doPreventDefault) {
+    handler = preventDefaultHandler;
+  } else {
+    handler = noPreventDefaultHandler;
+  }
+  window.removeEventListener("mozbrowserbeforekeydown", handler);
+  document.body.removeChild(document.getElementById("embedded"));
+
+  runTests();
+}
+
+var tests = [
+  function addPermissions() {
+    SpecialPowers.pushPermissions(
+      [{ type: "before-after-keyboard-event", allow: true, context: document },
+       { type: "browser", allow: true, context: document }],
+      runTests);
+  },
+  function addPreferences() {
+    SpecialPowers.pushPrefEnv(
+      { "set": [["dom.beforeAfterKeyboardEvent.enabled", true],
+                ["dom.mozBrowserFramesEnabled", true],
+                ["dom.ipc.tabs.disabled", false],
+                ["network.disable.ipc.security", true]] },
+      runTests);
+  },
+
+  prepareTest,
+  testDefaultAction,
+  teardownHandler,
+
+  function() {
+    gCurrentTest++;
+    runTests();
+  },
+  prepareTest,
+  testDefaultAction,
+  teardownHandler
+];
+
+function runTests()
+{
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+
+  var test = tests.shift();
+  test();
+}
+
+</script>
+</pre>
+</body>
+</html>