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diff --git a/dom/indexedDB/test/test_filehandle_workers.html b/dom/indexedDB/test/test_filehandle_workers.html
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+++ b/dom/indexedDB/test/test_filehandle_workers.html
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+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+  <title>File Handle Test</title>
+
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+
+  <script type="text/javascript">
+  function* testSteps()
+  {
+    const name = window.location.pathname;
+
+    let testBuffer = getRandomBuffer(100000);
+
+    let request = indexedDB.open(name, 1);
+    request.onerror = errorHandler;
+    request.onupgradeneeded = grabEventAndContinueHandler;
+    request.onsuccess = errorHandler;
+    let event = yield undefined;
+
+    is(event.type, "upgradeneeded", "Got correct event type");
+
+    let db = event.target.result;
+    db.onerror = errorHandler;
+
+    db.createObjectStore("Foo", { });
+
+    request.onupgradeneeded = errorHandler;
+    request.onsuccess = grabEventAndContinueHandler;
+    event = yield undefined;
+
+    is(event.type, "success", "Got correct event type");
+
+    request = db.createMutableFile("test.txt");
+    request.onerror = errorHandler;
+    request.onsuccess = grabEventAndContinueHandler;
+    event = yield undefined;
+
+    let mutableFile = event.target.result;
+
+    function dummyWorkerScript() {
+      /* eslint-env worker */
+      onmessage = function(event) {
+        throw new Error("Shouldn't be called!");
+      };
+    }
+
+    let url =
+      URL.createObjectURL(new Blob(["(", dummyWorkerScript.toString(), ")()"]));
+
+    let worker1 = new Worker(url);
+    try {
+      worker1.postMessage(mutableFile);
+      ok(false, "Should have thrown!");
+    }
+    catch (e) {
+      ok(e instanceof DOMException, "Got exception.");
+      is(e.name, "DataCloneError", "Good error.");
+      is(e.code, DOMException.DATA_CLONE_ERR, "Good error code.");
+    }
+
+    mutableFile.onerror = errorHandler;
+
+    let fileHandle = mutableFile.open("readwrite");
+
+    request = fileHandle.write(testBuffer);
+    request.onsuccess = grabEventAndContinueHandler;
+    event = yield undefined;
+
+    let objectStore =
+      db.transaction("Foo", "readwrite").objectStore("Foo");
+
+    request = objectStore.add(mutableFile, 42);
+    request.onsuccess = grabEventAndContinueHandler;
+    event = yield undefined;
+
+    function workerScript() {
+      onmessage = function(event) {
+        var name = event.data;
+        var request = indexedDB.open(name, 1);
+        request.onsuccess = function(event) {
+          var db = event.target.result;
+          let objectStore = db.transaction("Foo").objectStore("Foo");
+          request = objectStore.get(42);
+          request.onsuccess = function(event) {
+            try {
+              // eslint-disable-next-line no-unused-vars
+              let result = request.result;
+              postMessage("error");
+            }
+            catch (e) {
+              postMessage("success");
+            }
+          };
+          request.onerror = function(event) {
+            postMessage("error");
+          };
+        };
+        request.onerror = function(event) {
+          postMessage("error");
+        };
+      };
+    }
+
+    url = URL.createObjectURL(new Blob(["(", workerScript.toString(), ")()"]));
+
+    let worker2 = new Worker(url);
+    URL.revokeObjectURL(url);
+    worker2.postMessage(name);
+    worker2.onmessage = grabEventAndContinueHandler;
+    event = yield undefined;
+
+    is(event.data, "success", "Good response.");
+
+    todo(false, "Terminate all workers at the end of the test to work around bug 1340941.");
+    worker1.terminate();
+    worker2.terminate();
+
+    finishTest();
+  }
+  </script>
+  <script type="text/javascript" src="file.js"></script>
+  <script type="text/javascript" src="helpers.js"></script>
+
+</head>
+
+<body onload="runTest();"></body>
+
+</html>