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diff --git a/toolkit/components/webextensions/test/mochitest/test_ext_contentscript_exporthelpers.html b/toolkit/components/webextensions/test/mochitest/test_ext_contentscript_exporthelpers.html
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+++ b/toolkit/components/webextensions/test/mochitest/test_ext_contentscript_exporthelpers.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for content script</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/ExtensionTestUtils.js"></script>
+  <script type="text/javascript" src="head.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
+</head>
+<body>
+
+<script>
+"use strict";
+
+add_task(function* test_contentscript_exportHelpers() {
+  function contentScript() {
+    browser.test.assertTrue(typeof cloneInto === "function");
+    browser.test.assertTrue(typeof createObjectIn === "function");
+    browser.test.assertTrue(typeof exportFunction === "function");
+
+    /* globals exportFunction, precisePi, reportPi */
+    let value = 3.14;
+    exportFunction(() => value, window, {defineAs: "precisePi"});
+
+    browser.test.assertEq("undefined", typeof precisePi,
+        "exportFunction should export to the page's scope only");
+
+    browser.test.assertEq("undefined", typeof window.precisePi,
+        "exportFunction should export to the page's scope only");
+
+    let results = [];
+    exportFunction(pi => results.push(pi), window, {defineAs: "reportPi"});
+
+    let s = document.createElement("script");
+    s.textContent = `(${function() {
+      let result1 = "unknown 1";
+      let result2 = "unknown 2";
+      try {
+        result1 = precisePi();
+      } catch (e) {
+        result1 = "err:" + e;
+      }
+      try {
+        result2 = window.precisePi();
+      } catch (e) {
+        result2 = "err:" + e;
+      }
+      reportPi(result1);
+      reportPi(result2);
+    }})();`;
+
+    document.documentElement.appendChild(s);
+    // Inline script ought to run synchronously.
+
+    browser.test.assertEq(3.14, results[0],
+        "exportFunction on window should define a global function");
+    browser.test.assertEq(3.14, results[1],
+        "exportFunction on window should export a property to window.");
+
+    browser.test.assertEq(2, results.length,
+        "Expecting the number of results to match the number of method calls");
+
+    browser.test.notifyPass("export helper test completed");
+  }
+
+  let extensionData = {
+    manifest: {
+      content_scripts: [{
+        js: ["contentscript.js"],
+        matches: ["http://mochi.test/*/file_sample.html"],
+        run_at: "document_start",
+      }],
+    },
+
+    files: {
+      "contentscript.js": contentScript,
+    },
+  };
+
+  let extension = ExtensionTestUtils.loadExtension(extensionData);
+
+  yield extension.startup();
+
+  let win = window.open("file_sample.html");
+
+  yield extension.awaitFinish("export helper test completed");
+  win.close();
+
+  yield extension.unload();
+});
+</script>
+
+</body>
+</html>