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diff --git a/dom/workers/test/test_fileReaderSync.xhtml b/dom/workers/test/test_fileReaderSync.xhtml
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+++ b/dom/workers/test/test_fileReaderSync.xhtml
@@ -0,0 +1,198 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=664783
+-->
+<window title="Mozilla Bug 664783"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <script type="application/javascript" src="dom_worker_helper.js"/>
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=664783"
+     target="_blank">Mozilla Bug 664783</a>
+
+  <div id="content" style="display: none">
+    <input id="fileList" type="file"></input>
+  </div>
+
+  </body>
+
+  <!-- test code goes here -->
+  <script type="application/javascript">
+  <![CDATA[
+
+  /** Test for Bug 664783 **/
+
+  var fileNum = 0;
+
+  /**
+   * Create a file which contains the given data and optionally adds the specified file extension.
+   */
+  function createFileWithData(fileData, /** optional */ extension) {
+    var testFile = Cc["@mozilla.org/file/directory_service;1"]
+                       .getService(Ci.nsIProperties)
+                       .get("ProfD", Ci.nsIFile);
+    var fileExtension = (extension == undefined) ? "" : "." + extension;
+    testFile.append("workerFileReaderSync" + fileNum++ + fileExtension);
+
+    var outStream = Cc["@mozilla.org/network/file-output-stream;1"]
+                        .createInstance(Ci.nsIFileOutputStream);
+    outStream.init(testFile, 0x02 | 0x08 | 0x20, // write, create, truncate
+                   0o666, 0);
+    outStream.write(fileData, fileData.length);
+    outStream.close();
+
+    var fileList = document.getElementById('fileList');
+    fileList.value = testFile.path;
+
+    return fileList.files[0];
+  }
+
+  function convertToUTF16(s) {
+    res = "";
+    for (var i = 0; i < s.length; ++i) {
+      c = s.charCodeAt(i);
+      res += String.fromCharCode(c & 255, c >>> 8);
+    }
+    return res;
+  }
+
+  /**
+   * Converts the given string to a data URL of the specified mime type.
+   */
+  function convertToDataURL(mime, s) {
+    return "data:" + mime + ";base64," + btoa(s);
+  }
+
+  /**
+   * Create a worker to read a file containing fileData using FileReaderSync and
+   * checks the return type against the expected type. Optionally set an encoding
+   * for reading the file as text.
+   */
+  function readFileData(fileData, expectedText, /** optional */ encoding) {
+    var worker = new Worker("fileReaderSync_worker.js");
+
+    worker.onmessage = function(event) {
+      is(event.data.text, expectedText, "readAsText in worker returned incorrect result.");
+      is(event.data.bin, fileData, "readAsBinaryString in worker returned incorrect result.");
+      is(event.data.url, convertToDataURL("application/octet-stream", fileData), "readAsDataURL in worker returned incorrect result.");
+      is(event.data.arrayBuffer.byteLength, fileData.length, "readAsArrayBuffer returned buffer of incorrect length.");
+      finish();
+    };
+
+    worker.onerror = function(event) {
+      ok(false, "Worker had an error: " + event.message);
+      finish();
+    };
+
+    var params = {file: createFileWithData(fileData), encoding: encoding};
+
+    worker.postMessage(params);
+
+    waitForWorkerFinish();
+  }
+
+  /**
+   * Create a worker which reuses a FileReaderSync to read multiple files as DataURLs.
+   */
+  function reuseReaderForURL(files, expected) {
+    var worker = new Worker("fileReaderSync_worker.js");
+
+    worker.onerror = function(event) {
+      ok(false, "Worker had an error: " + event.message);
+      finish();
+    };
+
+    var k = 0;
+    worker.onmessage = function(event) {
+      is(event.data.url, expected[k], "readAsDataURL in worker returned incorrect result when reusing FileReaderSync.");
+      k++;
+      finish();
+    };
+
+    for (var i = 0; i < files.length; ++i) {
+      var params = {file: files[i], encoding: undefined};
+      worker.postMessage(params);
+      waitForWorkerFinish();
+    }
+  }
+
+  /**
+   * Create a worker which reuses a FileReaderSync to read multiple files as text.
+   */
+  function reuseReaderForText(fileData, expected) {
+    var worker = new Worker("fileReaderSync_worker.js");
+
+    worker.onerror = function(event) {
+      ok(false, "Worker had an error: " + event.message);
+      finish();
+    };
+
+    var k = 0;
+    worker.onmessage = function(event) {
+      is(event.data.text, expected[k++], "readAsText in worker returned incorrect result when reusing FileReaderSync.");
+      finish();
+    };
+
+    for (var i = 0; i < fileData.length; ++i) {
+      var params = {file: createFileWithData(fileData[i]), encoding: undefined};
+      worker.postMessage(params);
+      waitForWorkerFinish();
+    }
+  }
+
+
+  /**
+   * Creates a a worker which reads a file containing fileData as an ArrayBuffer.
+   * Verifies that the ArrayBuffer when interpreted as a string matches the original data.
+   */
+  function readArrayBuffer(fileData) {
+    var worker = new Worker("fileReaderSync_worker.js");
+
+    worker.onmessage = function(event) {
+      var view = new Uint8Array(event.data.arrayBuffer);
+      is(event.data.arrayBuffer.byteLength, fileData.length, "readAsArrayBuffer returned buffer of incorrect length.");
+      is(String.fromCharCode.apply(String, view), fileData, "readAsArrayBuffer returned buffer containing incorrect data.");
+      finish();
+    };
+
+    worker.onerror = function(event) {
+      ok(false, "Worker had an error: " + event.message);
+      finish();
+    };
+
+    var params = {file: createFileWithData(fileData), encoding: undefined};
+
+    worker.postMessage(params);
+
+    waitForWorkerFinish();
+  }
+
+  // Empty file.
+  readFileData("", "");
+
+  // Typical use case.
+  readFileData("text", "text");
+
+  // Test reading UTF-16 characters.
+  readFileData(convertToUTF16("text"), "text", "UTF-16");
+
+  // First read a file of type "text/plain", then read a file of type "application/octet-stream".
+  reuseReaderForURL([createFileWithData("text", "txt"), createFileWithData("text")],
+                    [convertToDataURL("text/plain", "text"),
+                     convertToDataURL("application/octet-stream", "text")]);
+
+  // First read UTF-16 characters marked using BOM, then read UTF-8 characters.
+  reuseReaderForText([convertToUTF16("\ufefftext"), "text"],
+                     ["text", "text"]);
+
+  // Reading data as ArrayBuffer.
+  readArrayBuffer("");
+  readArrayBuffer("text");
+
+  ]]>
+  </script>
+</window>