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diff --git a/dom/serviceworkers/test/test_navigator.html b/dom/serviceworkers/test/test_navigator.html
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+++ b/dom/serviceworkers/test/test_navigator.html
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+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 930348 - test stub Navigator ServiceWorker utilities.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+
+  function checkEnabled() {
+    ok(navigator.serviceWorker, "navigator.serviceWorker should exist when ServiceWorkers are enabled.");
+    ok(typeof navigator.serviceWorker.register === "function", "navigator.serviceWorker.register() should be a function.");
+    ok(typeof navigator.serviceWorker.getRegistration === "function", "navigator.serviceWorker.getAll() should be a function.");
+    ok(typeof navigator.serviceWorker.getRegistrations === "function", "navigator.serviceWorker.getAll() should be a function.");
+    ok(navigator.serviceWorker.ready instanceof Promise, "navigator.serviceWorker.ready should be a Promise.");
+    ok(navigator.serviceWorker.controller === null, "There should be no controller worker for an uncontrolled document.");
+  }
+
+  SimpleTest.waitForExplicitFinish();
+
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, function() {
+    checkEnabled();
+    SimpleTest.finish();
+  });
+</script>
+</pre>
+</body>
+</html>