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diff --git a/dom/crypto/test/file_indexedDB.html b/dom/crypto/test/file_indexedDB.html
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+++ b/dom/crypto/test/file_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>
+</head>
+<body>
+  <script type="application/javascript;version=1.8">
+    let db;
+
+    function err(resolve) {
+      return e => resolve(e.target.error.message);
+    }
+
+    function openDatabase() {
+      return new Promise((resolve, reject) => {
+        let request = indexedDB.open("keystore", 1);
+
+        request.onerror = err(reject);
+        request.onsuccess = function (event) {
+          db = event.target.result;
+          resolve();
+        };
+
+        request.onupgradeneeded = function(event) {
+          db = event.target.result;
+          let objectStore = db.createObjectStore("keys", {autoIncrement: true});
+          objectStore.transaction.oncomplete = resolve;
+        };
+      });
+    }
+
+    function storeKey(key) {
+      return new Promise((resolve, reject) => {
+        let transaction = db.transaction("keys", "readwrite");
+        transaction.objectStore("keys").put(key, key.type);
+
+        transaction.onabort = err(reject);
+        transaction.onerror = err(reject);
+
+        transaction.oncomplete = function () {
+          resolve(key);
+        };
+      });
+    };
+
+    function retrieveKey() {
+      return new Promise((resolve, reject) => {
+        let transaction = db.transaction("keys", "readonly");
+        let cursor = transaction.objectStore("keys").openCursor();
+
+        cursor.onerror = err(reject);
+        cursor.onabort = err(reject);
+
+        cursor.onsuccess = function (event) {
+          try {
+            let result = event.target.result;
+            resolve(result && result.value);
+          } catch (e) {
+            reject(e.message);
+          }
+        };
+      });
+    }
+
+    function generateKey() {
+      let algorithm = {
+        name: "RSASSA-PKCS1-v1_5",
+        hash: "SHA-256",
+        modulusLength: 1024,
+        publicExponent: new Uint8Array([0x01, 0x00, 0x01])
+      };
+
+      return crypto.subtle.generateKey(algorithm, true, ["sign", "verify"]);
+    }
+
+    openDatabase()
+      .then(retrieveKey).then(generateKey).then(storeKey)
+      .then(() => alert("ok")).catch(alert);
+  </script>
+</body>
+</html>