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diff --git a/dom/crypto/test/test_indexedDB.html b/dom/crypto/test/test_indexedDB.html
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+++ b/dom/crypto/test/test_indexedDB.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Bug 1188750 - WebCrypto must ensure NSS is initialized before deserializing</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"?>
+</head>
+<body>
+  <script type="application/javascript;version=1.8">
+    /*
+     * Bug 1188750 - The WebCrypto API must ensure that NSS was initialized
+     * for the current process before trying to deserialize objects like
+     * CryptoKeys from e.g. IndexedDB.
+     */
+    "use strict";
+
+    const TEST_URI = "http://www.example.com/tests/" +
+                     "dom/crypto/test/file_indexedDB.html";
+
+    SimpleTest.waitForExplicitFinish();
+
+    function createMozBrowserFrame(cb) {
+      let frame = document.createElement("iframe");
+      SpecialPowers.wrap(frame).mozbrowser = true;
+      frame.src = TEST_URI;
+
+      frame.addEventListener("mozbrowsershowmodalprompt", function onPrompt(e) {
+        frame.removeEventListener("mozbrowsershowmodalprompt", onPrompt);
+        cb(frame, e.detail.message);
+      });
+
+      document.body.appendChild(frame);
+    }
+
+    function runTest() {
+      // Load the test app once, to generate and store keys.
+      createMozBrowserFrame((frame, result) => {
+        is(result, "ok", "stored keys successfully");
+        frame.remove();
+
+        // Load the test app again to retrieve stored keys.
+        createMozBrowserFrame((frame, result) => {
+          is(result, "ok", "retrieved keys successfully");
+          frame.remove();
+          SimpleTest.finish();
+        });
+      });
+    }
+
+    addEventListener("load", function () {
+      SpecialPowers.addPermission("browser", true, document);
+      SpecialPowers.pushPrefEnv({set: [
+        ["dom.ipc.browser_frames.oop_by_default", true],
+        ["dom.mozBrowserFramesEnabled", true],
+        ["network.disable.ipc.security", true]
+      ]}, runTest);
+    });
+  </script>
+</body>
+</html>