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diff --git a/dom/browser-element/mochitest/priority/test_Background.html b/dom/browser-element/mochitest/priority/test_Background.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+Test that calling setVisible('false') on an iframe causes its visibility to
+change.
+-->
+<head>
+ <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="application/javascript" src="../browserElementTestHelpers.js"></script>
+ <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<script type="application/javascript;version=1.7">
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+browserElementTestHelpers.setEnabledPref(true);
+browserElementTestHelpers.enableProcessPriorityManager();
+
+function runTest() {
+ var iframe = document.createElement('iframe');
+ iframe.setAttribute('mozbrowser', true);
+
+ iframe.src = browserElementTestHelpers.emptyPage1;
+
+ var childID = null;
+ Promise.all([
+ expectOnlyOneProcessCreated('FOREGROUND').then(function(chid) {
+ childID = chid;
+ }),
+ expectMozbrowserEvent(iframe, 'loadend')
+ ]).then(function() {
+ var p = expectPriorityChange(childID, 'BACKGROUND');
+
+ // We wait until mozbrowserloadend before calling setVisible, because
+ // setVisible isn't available until mozbrowser has loaded. In practice, that
+ // means we can call setVisible once we've gotten /any/ mozbrowser event.
+ iframe.setVisible(false);
+ return p;
+ }).then(function() {
+ var p = expectPriorityChange(childID, 'FOREGROUND');
+ iframe.setVisible(true);
+ }).then(SimpleTest.finish);
+
+ document.body.appendChild(iframe);
+}
+
+addEventListener('testready', runTest);
+
+</script>
+</body>
+</html>