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diff --git a/testing/mochitest/chrome-harness.js b/testing/mochitest/chrome-harness.js
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+++ b/testing/mochitest/chrome-harness.js
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+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+var { NetUtil } = ChromeUtils.importESModule(
+  "resource://gre/modules/NetUtil.sys.mjs"
+);
+
+/* import-globals-from manifestLibrary.js */
+
+// Defined in browser-test.js
+/* global gTestPath */
+
+/*
+ * getChromeURI converts a URL to a URI
+ *
+ * url: string of a URL (http://mochi.test/test.html)
+ * returns: a nsiURI object representing the given URL
+ *
+ */
+function getChromeURI(url) {
+  return Services.io.newURI(url);
+}
+
+/*
+ * Convert a URL (string) into a nsIURI or NSIJARURI
+ * This is intended for URL's that are on a file system
+ * or in packaged up in an extension .jar file
+ *
+ * url: a string of a url on the local system(http://localhost/blah.html)
+ */
+function getResolvedURI(url) {
+  var chromeURI = getChromeURI(url);
+  var resolvedURI = Cc["@mozilla.org/chrome/chrome-registry;1"]
+    .getService(Ci.nsIChromeRegistry)
+    .convertChromeURL(chromeURI);
+
+  try {
+    resolvedURI = resolvedURI.QueryInterface(Ci.nsIJARURI);
+  } catch (ex) {} // not a jar file
+
+  return resolvedURI;
+}
+
+/**
+ *  getChromeDir is intended to be called after getResolvedURI and convert
+ *  the input URI into a nsIFile (actually the directory containing the
+ *  file).  This can be used for copying or referencing the file or extra files
+ *  required by the test.  Usually we need to load a secondary html file or library
+ *  and this will give us file system access to that.
+ *
+ *  resolvedURI: nsIURI (from getResolvedURI) that points to a file:/// url
+ */
+function getChromeDir(resolvedURI) {
+  var fileHandler = Cc["@mozilla.org/network/protocol;1?name=file"].getService(
+    Ci.nsIFileProtocolHandler
+  );
+  var chromeDir = fileHandler.getFileFromURLSpec(resolvedURI.spec);
+  return chromeDir.parent.QueryInterface(Ci.nsIFile);
+}
+
+// used by tests to determine their directory based off window.location.path
+function getRootDirectory(path, chromeURI) {
+  if (chromeURI === undefined) {
+    chromeURI = getChromeURI(path);
+  }
+  var myURL = chromeURI.QueryInterface(Ci.nsIURL);
+  var mydir = myURL.directory;
+
+  if (mydir.match("/$") != "/") {
+    mydir += "/";
+  }
+
+  return chromeURI.prePath + mydir;
+}
+
+// used by tests to determine their directory based off window.location.path
+function getChromePrePath(path, chromeURI) {
+  if (chromeURI === undefined) {
+    chromeURI = getChromeURI(path);
+  }
+
+  return chromeURI.prePath;
+}
+
+/*
+ * Given a URI, return nsIJARURI or null
+ */
+function getJar(uri) {
+  var resolvedURI = getResolvedURI(uri);
+  var jar = null;
+  try {
+    if (resolvedURI.JARFile) {
+      jar = resolvedURI;
+    }
+  } catch (ex) {}
+  return jar;
+}
+
+/*
+ * input:
+ *  jar: a nsIJARURI object with the jarfile and jarentry (path in jar file)
+ *
+ * output;
+ *  all files and subdirectories inside jarentry will be extracted to TmpD/mochikit.tmp
+ *  we will return the location of /TmpD/mochikit.tmp* so you can reference the files locally
+ */
+function extractJarToTmp(jar) {
+  var tmpdir = Services.dirsvc.get("ProfD", Ci.nsIFile);
+  tmpdir.append("mochikit.tmp");
+  // parseInt is used because octal escape sequences cause deprecation warnings
+  // in strict mode (which is turned on in debug builds)
+  tmpdir.createUnique(Ci.nsIFile.DIRECTORY_TYPE, parseInt("0777", 8));
+
+  var zReader = Cc["@mozilla.org/libjar/zip-reader;1"].createInstance(
+    Ci.nsIZipReader
+  );
+
+  var fileHandler = Cc["@mozilla.org/network/protocol;1?name=file"].getService(
+    Ci.nsIFileProtocolHandler
+  );
+
+  var fileName = fileHandler.getFileFromURLSpec(jar.JARFile.spec);
+  zReader.open(fileName);
+
+  // filepath represents the path in the jar file without the filename
+  var filepath = "";
+  var parts = jar.JAREntry.split("/");
+  for (var i = 0; i < parts.length - 1; i++) {
+    if (parts[i] != "") {
+      filepath += parts[i] + "/";
+    }
+  }
+
+  /* Create dir structure first, no guarantee about ordering of directories and
+   * files returned from findEntries.
+   */
+  for (let dir of zReader.findEntries(filepath + "*/")) {
+    var targetDir = buildRelativePath(dir, tmpdir, filepath);
+    // parseInt is used because octal escape sequences cause deprecation warnings
+    // in strict mode (which is turned on in debug builds)
+    if (!targetDir.exists()) {
+      targetDir.create(Ci.nsIFile.DIRECTORY_TYPE, parseInt("0777", 8));
+    }
+  }
+
+  // now do the files
+  for (var fname of zReader.findEntries(filepath + "*")) {
+    if (fname.substr(-1) != "/") {
+      var targetFile = buildRelativePath(fname, tmpdir, filepath);
+      zReader.extract(fname, targetFile);
+    }
+  }
+  return tmpdir;
+}
+
+/*
+ * Take a relative path from the current mochitest file
+ * and returns the absolute path for the given test data file.
+ */
+function getTestFilePath(path) {
+  if (path[0] == "/") {
+    throw new Error("getTestFilePath only accepts relative path");
+  }
+  // Get the chrome/jar uri for the current mochitest file
+  // gTestPath being defined by the test harness in browser-chrome tests
+  // or window is being used for mochitest-browser
+  var baseURI = typeof gTestPath == "string" ? gTestPath : window.location.href;
+  var parentURI = getResolvedURI(getRootDirectory(baseURI));
+  var file;
+  if (parentURI.JARFile) {
+    // If it's a jar/zip, we have to extract it first
+    file = extractJarToTmp(parentURI);
+  } else {
+    // Otherwise, we can directly cast it to a file URI
+    var fileHandler = Cc[
+      "@mozilla.org/network/protocol;1?name=file"
+    ].getService(Ci.nsIFileProtocolHandler);
+    file = fileHandler.getFileFromURLSpec(parentURI.spec);
+  }
+  // Then walk by the given relative path
+  path.split("/").forEach(function (p) {
+    if (p == "..") {
+      file = file.parent;
+    } else if (p != ".") {
+      file.append(p);
+    }
+  });
+  return file.path;
+}
+
+/*
+ * Simple utility function to take the directory structure in jarentryname and
+ * translate that to a path of a nsIFile.
+ */
+function buildRelativePath(jarentryname, destdir, basepath) {
+  var baseParts = basepath.split("/");
+  if (baseParts[baseParts.length - 1] == "") {
+    baseParts.pop();
+  }
+
+  var parts = jarentryname.split("/");
+
+  var targetFile = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsIFile);
+  targetFile.initWithFile(destdir);
+
+  for (var i = baseParts.length; i < parts.length; i++) {
+    targetFile.append(parts[i]);
+  }
+
+  return targetFile;
+}
+
+function readConfig(filename) {
+  filename = filename || "testConfig.js";
+
+  var configFile = Services.dirsvc.get("ProfD", Ci.nsIFile);
+  configFile.append(filename);
+
+  if (!configFile.exists()) {
+    return {};
+  }
+
+  var fileInStream = Cc[
+    "@mozilla.org/network/file-input-stream;1"
+  ].createInstance(Ci.nsIFileInputStream);
+  fileInStream.init(configFile, -1, 0, 0);
+
+  var str = NetUtil.readInputStreamToString(
+    fileInStream,
+    fileInStream.available()
+  );
+  fileInStream.close();
+  return JSON.parse(str);
+}
+
+function getTestList(params, callback) {
+  var baseurl = "chrome://mochitests/content";
+  if (window.parseQueryString) {
+    params = window.parseQueryString(location.search.substring(1), true);
+  }
+  if (!params.baseurl) {
+    params.baseurl = baseurl;
+  }
+
+  var config = readConfig();
+  for (var p in params) {
+    if (params[p] == 1) {
+      config[p] = true;
+    } else if (params[p] == 0) {
+      config[p] = false;
+    } else {
+      config[p] = params[p];
+    }
+  }
+  params = config;
+  getTestManifest(
+    "http://mochi.test:8888/" + params.manifestFile,
+    params,
+    callback
+  );
+}