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+<!DOCTYPE HTML>
+<html>
+<!--
+A simple test of the process priority manager.
+
+https://bugzilla.mozilla.org/show_bug.cgi?id=844323
+
+Note: If you run this test alone (i.e. not as part of the larger mochitest
+suite), you may see some IPC assertions, e.g. "Can't allocate graphics
+resources."
+
+What appears to be happening is that we close the Firefox window before the
+frame we create in this tab finishes starting up.  Then the frame finishes
+loading, and it tries to show itself.  But it's too late to show a remote frame
+at that point, so we kill the child process.
+
+In other words, I think these errors are nothing to worry about.
+-->
+<head>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="../browserElementTestHelpers.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<script type="application/javascript;version=1.7">
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+browserElementTestHelpers.setEnabledPref(true);
+browserElementTestHelpers.addPermission();
+browserElementTestHelpers.enableProcessPriorityManager();
+
+var allCompleted = 0;
+var allExpected  = 2;
+function finish() {
+  allCompleted++;
+  if (allCompleted === allExpected) {
+    SimpleTest.finish();
+  }
+}
+
+function runTest() {
+  var iframeLoaded = false;
+  var iframe = document.createElement('iframe');
+  iframe.setAttribute('mozbrowser', true);
+  iframe.src = browserElementTestHelpers.emptyPage1;
+
+  iframe.addEventListener('mozbrowserloadend', finish);
+  expectProcessCreated('FOREGROUND').then(finish);
+
+  document.body.appendChild(iframe);
+}
+
+addEventListener('testready', runTest);
+
+</script>
+</body>
+</html>