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diff --git a/netwerk/test/unit/test_redirect_from_script.js b/netwerk/test/unit/test_redirect_from_script.js
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+/*
+ * Test whether the rewrite-requests-from-script API implemented here:
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=765934 is functioning
+ * correctly
+ *
+ * The test has the following components:
+ *
+ * testViaXHR() checks that internal redirects occur correctly for requests
+ * made with XMLHttpRequest objects.
+ *
+ * testViaAsyncOpen() checks that internal redirects occur correctly when made
+ * with nsIHTTPChannel.asyncOpen().
+ *
+ * Both of the above functions tests four requests:
+ *
+ * Test 1: a simple case that redirects within a server;
+ * Test 2: a second that redirects to a second webserver;
+ * Test 3: internal script redirects in response to a server-side 302 redirect;
+ * Test 4: one internal script redirects in response to another's redirect.
+ *
+ * The successful redirects are confirmed by the presence of a custom response
+ * header.
+ *
+ */
+"use strict";
+
+const { HttpServer } = ChromeUtils.import("resource://testing-common/httpd.js");
+
+// the topic we observe to use the API.  http-on-opening-request might also
+// work for some purposes.
+let redirectHook = "http-on-modify-request";
+
+var httpServer = null,
+  httpServer2 = null;
+
+XPCOMUtils.defineLazyGetter(this, "port1", function () {
+  return httpServer.identity.primaryPort;
+});
+
+XPCOMUtils.defineLazyGetter(this, "port2", function () {
+  return httpServer2.identity.primaryPort;
+});
+
+// Test Part 1: a cross-path redirect on a single HTTP server
+// http://localhost:port1/bait -> http://localhost:port1/switch
+var baitPath = "/bait";
+XPCOMUtils.defineLazyGetter(this, "baitURI", function () {
+  return "http://localhost:" + port1 + baitPath;
+});
+var baitText = "you got the worm";
+
+var redirectedPath = "/switch";
+XPCOMUtils.defineLazyGetter(this, "redirectedURI", function () {
+  return "http://localhost:" + port1 + redirectedPath;
+});
+var redirectedText = "worms are not tasty";
+
+// Test Part 2: Now, a redirect to a different server
+// http://localhost:port1/bait2 -> http://localhost:port2/switch
+var bait2Path = "/bait2";
+XPCOMUtils.defineLazyGetter(this, "bait2URI", function () {
+  return "http://localhost:" + port1 + bait2Path;
+});
+
+XPCOMUtils.defineLazyGetter(this, "redirected2URI", function () {
+  return "http://localhost:" + port2 + redirectedPath;
+});
+
+// Test Part 3, begin with a serverside redirect that itself turns into an instance
+// of Test Part 1
+var bait3Path = "/bait3";
+XPCOMUtils.defineLazyGetter(this, "bait3URI", function () {
+  return "http://localhost:" + port1 + bait3Path;
+});
+
+// Test Part 4, begin with this client-side redirect and which then redirects
+// to an instance of Test Part 1
+var bait4Path = "/bait4";
+XPCOMUtils.defineLazyGetter(this, "bait4URI", function () {
+  return "http://localhost:" + port1 + bait4Path;
+});
+
+var testHeaderName = "X-Redirected-By-Script";
+var testHeaderVal = "Success";
+var testHeaderVal2 = "Success on server 2";
+
+function make_channel(url, callback, ctx) {
+  return NetUtil.newChannel({ uri: url, loadUsingSystemPrincipal: true });
+}
+
+function baitHandler(metadata, response) {
+  // Content-Type required: https://bugzilla.mozilla.org/show_bug.cgi?id=748117
+  response.setHeader("Content-Type", "text/html", false);
+  response.bodyOutputStream.write(baitText, baitText.length);
+}
+
+function redirectedHandler(metadata, response) {
+  response.setHeader("Content-Type", "text/html", false);
+  response.bodyOutputStream.write(redirectedText, redirectedText.length);
+  response.setHeader(testHeaderName, testHeaderVal);
+}
+
+function redirected2Handler(metadata, response) {
+  response.setHeader("Content-Type", "text/html", false);
+  response.bodyOutputStream.write(redirectedText, redirectedText.length);
+  response.setHeader(testHeaderName, testHeaderVal2);
+}
+
+function bait3Handler(metadata, response) {
+  response.setHeader("Content-Type", "text/html", false);
+  response.setStatusLine(metadata.httpVersion, 302, "Found");
+  response.setHeader("Location", baitURI);
+}
+
+function Redirector() {
+  this.register();
+}
+
+Redirector.prototype = {
+  // This class observes an event and uses that to
+  // trigger a redirectTo(uri) redirect using the new API
+  register() {
+    Services.obs.addObserver(this, redirectHook, true);
+  },
+
+  QueryInterface: ChromeUtils.generateQI([
+    "nsIObserver",
+    "nsISupportsWeakReference",
+  ]),
+
+  observe(subject, topic, data) {
+    if (topic == redirectHook) {
+      if (!(subject instanceof Ci.nsIHttpChannel)) {
+        do_throw(redirectHook + " observed a non-HTTP channel");
+      }
+      var channel = subject.QueryInterface(Ci.nsIHttpChannel);
+      var target = null;
+      if (channel.URI.spec == baitURI) {
+        target = redirectedURI;
+      }
+      if (channel.URI.spec == bait2URI) {
+        target = redirected2URI;
+      }
+      if (channel.URI.spec == bait4URI) {
+        target = baitURI;
+      }
+      // if we have a target, redirect there
+      if (target) {
+        var tURI = Services.io.newURI(target);
+        try {
+          channel.redirectTo(tURI);
+        } catch (e) {
+          do_throw("Exception in redirectTo " + e + "\n");
+        }
+      }
+    }
+  },
+};
+
+function makeAsyncTest(uri, headerValue, nextTask) {
+  // Make a test to check a redirect that is created with channel.asyncOpen()
+
+  // Produce a callback function which checks for the presence of headerValue,
+  // and then continues to the next async test task
+  var verifier = function (req, buffer) {
+    if (!(req instanceof Ci.nsIHttpChannel)) {
+      do_throw(req + " is not an nsIHttpChannel, catastrophe imminent!");
+    }
+
+    var httpChannel = req.QueryInterface(Ci.nsIHttpChannel);
+    Assert.equal(httpChannel.getResponseHeader(testHeaderName), headerValue);
+    Assert.equal(buffer, redirectedText);
+    nextTask();
+  };
+
+  // Produce a function to run an asyncOpen test using the above verifier
+  var test = function () {
+    var chan = make_channel(uri);
+    chan.asyncOpen(new ChannelListener(verifier));
+  };
+  return test;
+}
+
+// will be defined in run_test because of the lazy getters,
+// since the server's port is defined dynamically
+var testViaAsyncOpen4 = null;
+var testViaAsyncOpen3 = null;
+var testViaAsyncOpen2 = null;
+var testViaAsyncOpen = null;
+
+function testViaXHR() {
+  runXHRTest(baitURI, testHeaderVal);
+  runXHRTest(bait2URI, testHeaderVal2);
+  runXHRTest(bait3URI, testHeaderVal);
+  runXHRTest(bait4URI, testHeaderVal);
+}
+
+function runXHRTest(uri, headerValue) {
+  // Check that making an XHR request for uri winds up redirecting to a result with the
+  // appropriate headerValue
+  var req = new XMLHttpRequest();
+  req.open("GET", uri, false);
+  req.send();
+  Assert.equal(req.getResponseHeader(testHeaderName), headerValue);
+  Assert.equal(req.response, redirectedText);
+}
+
+function done() {
+  httpServer.stop(function () {
+    httpServer2.stop(do_test_finished);
+  });
+}
+
+// Needed for side-effects
+new Redirector();
+
+function run_test() {
+  httpServer = new HttpServer();
+  httpServer.registerPathHandler(baitPath, baitHandler);
+  httpServer.registerPathHandler(bait2Path, baitHandler);
+  httpServer.registerPathHandler(bait3Path, bait3Handler);
+  httpServer.registerPathHandler(bait4Path, baitHandler);
+  httpServer.registerPathHandler(redirectedPath, redirectedHandler);
+  httpServer.start(-1);
+  httpServer2 = new HttpServer();
+  httpServer2.registerPathHandler(redirectedPath, redirected2Handler);
+  httpServer2.start(-1);
+
+  // The tests depend on each other, and therefore need to be defined in the
+  // reverse of the order they are called in.  It is therefore best to read this
+  // stanza backwards!
+  testViaAsyncOpen4 = makeAsyncTest(bait4URI, testHeaderVal, done);
+  testViaAsyncOpen3 = makeAsyncTest(bait3URI, testHeaderVal, testViaAsyncOpen4);
+  testViaAsyncOpen2 = makeAsyncTest(
+    bait2URI,
+    testHeaderVal2,
+    testViaAsyncOpen3
+  );
+  testViaAsyncOpen = makeAsyncTest(baitURI, testHeaderVal, testViaAsyncOpen2);
+
+  testViaXHR();
+  testViaAsyncOpen(); // will call done() asynchronously for cleanup
+
+  do_test_pending();
+}