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diff --git a/caps/tests/mochitest/test_app_principal_equality.html b/caps/tests/mochitest/test_app_principal_equality.html
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+++ b/caps/tests/mochitest/test_app_principal_equality.html
@@ -0,0 +1,88 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=777467
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test app principal's equality</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=777467">Mozilla Bug 777467</a>
+<p id="display"></p>
+<script>
+
+/** Test for app principal's equality **/
+
+SimpleTest.waitForExplicitFinish();
+
+var permissions = new Promise(resolve => {
+  SpecialPowers.pushPermissions(
+    [{ type: "browser", allow: true, context: document },
+     { type: "embed-apps", allow: true, context: document }],
+    resolve);
+});
+
+permissions.then(() => {
+  $('content').innerHTML =
+    '<iframe src="error404"></iframe>\n' +
+    '<iframe mozbrowser src="error404"></iframe>\n' +
+    '<iframe mozapp="http://example.org/manifest.webapp" mozbrowser src="error404"></iframe>';
+
+  var iframes = document.getElementsByTagName("iframe");
+  var promises = []
+  for (var i = 0; i < promises.length; ++i) {
+    promises.push(new Promise(resolve => {
+      iframes[i].addEventListener("load", resolve);
+    }));
+  }
+
+  return Promise.all(promises);
+});
+
+var prefs = new Promise(resolve => {
+  SpecialPowers.pushPrefEnv(
+    { set: [[ "dom.mozBrowserFramesEnabled", true ],
+            [ "dom.ipc.browser_frames.oop_by_default", false ]] },
+    resolve);
+});
+</script>
+<div id="content" style="display: none;">
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+function canAccessDocument(win) {
+  var result = true;
+  try {
+    win.document;
+  } catch(e) {
+    result = false;
+  }
+  return result;
+}
+
+var loaded = new Promise(resolve => addLoadEvent(resolve));
+
+Promise.all([ permissions, prefs, loaded ]).then(runTest);
+
+function runTest() {
+  // Test the witness frame (we can access same-origin frame).
+  is(canAccessDocument(frames[0]), true,
+     "should be able to access the first frame");
+
+  // Test different app/browserElement frames.
+  for (var i=1; i<frames.length; ++i) {
+    is(canAccessDocument(frames[i]), false,
+       "should not be able to access the other frames");
+  }
+
+  SimpleTest.finish();
+}
+
+</script>
+</pre>
+</body>
+</html>