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diff --git a/dom/browser-element/mochitest/priority/test_Activity.html b/dom/browser-element/mochitest/priority/test_Activity.html
new file mode 100644
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+++ b/dom/browser-element/mochitest/priority/test_Activity.html
@@ -0,0 +1,62 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test that calling setVisible("false") on an iframe that has an open activity
+causes its priority 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 os = SpecialPowers.Cc["@mozilla.org/observer-service;1"]
+                        .getService(SpecialPowers.Ci.nsIObserverService);
+  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_PERCEIVABLE");
+
+    // We simulate opening an activity
+    os.notifyObservers(null, "activity-opened", childID);
+
+    // 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, "BACKGROUND");
+
+    // Now we simulate closing an activity
+    os.notifyObservers(null, "activity-closed", childID);
+
+    return p;
+  }).then(SimpleTest.finish);
+
+  document.body.appendChild(iframe);
+}
+
+addEventListener("testready", runTest);
+
+</script>
+</body>
+</html>