diff --git a/dom/plugins/PluginInstanceChild.cpp b/dom/plugins/PluginInstanceChild.cpp
index 760678374ec4..1554a6e7b71b 100644
--- a/dom/plugins/PluginInstanceChild.cpp
+++ b/dom/plugins/PluginInstanceChild.cpp
@@ -2090,7 +2090,7 @@ StreamNotifyChild::RecvRedirectNotify(const nsCString& url, const int32_t& statu
 
     PluginInstanceChild* instance = static_cast<PluginInstanceChild*>(Manager());
     if (instance->mPluginIface->urlredirectnotify)
-      instance->mPluginIface->urlredirectnotify(instance->GetNPP(), mURL.get(), status, mClosure);
+      instance->mPluginIface->urlredirectnotify(instance->GetNPP(), url.get(), status, mClosure);
 
     return true;
 }
diff --git a/modules/plugin/test/mochitest/test_newstreamondestroy.html b/modules/plugin/test/mochitest/test_newstreamondestroy.html
index e196150f9a61..044229a58958 100644
--- a/modules/plugin/test/mochitest/test_newstreamondestroy.html
+++ b/modules/plugin/test/mochitest/test_newstreamondestroy.html
@@ -22,7 +22,7 @@
       ok(!p.streamTest('loremipsum.txt', false, null, null,
                        function(r, t) {
                          ok(false, "get-during-destroy should have failed");
-                       }, true), "NPN_GetURLNotify should fail during NPP_Destroy");
+                       }, null, true), "NPN_GetURLNotify should fail during NPP_Destroy");
     });
     document.body.removeChild(p);
 
diff --git a/modules/plugin/test/mochitest/test_redirect_handling.html b/modules/plugin/test/mochitest/test_redirect_handling.html
index 6adc6c6019a7..e37f59778768 100644
--- a/modules/plugin/test/mochitest/test_redirect_handling.html
+++ b/modules/plugin/test/mochitest/test_redirect_handling.html
@@ -16,9 +16,13 @@
     var redirectTargetURL = "http://example.org/tests/modules/plugin/test/loremipsum.txt";
 
     var expectedWriteURL = "";
-    var expectedNotifyURL = "";
     var expectedNotifyStatus = -1;
 
+    function redirectCallback(url, httpStatus) {
+      is(url, redirectTargetURL, "Test for expected redirect notify URL.");
+      is(httpStatus, 307, "Test for expected http redirect status.");
+    }
+
     function writeCallback(url) {
       is(url, expectedWriteURL, "Test for expected stream write URL.");
     }
@@ -30,18 +34,16 @@
 
     function test1() {
       expectedWriteURL = "";
-      expectedNotifyURL = redirectingURL;
       expectedNotifyStatus = 1;
 
-      p.streamTest(redirectingURL, false, null, writeCallback, notifyCallback, false);
+      p.streamTest(redirectingURL, false, null, writeCallback, notifyCallback, redirectCallback, false);
     }
 
     function test2() {
       expectedWriteURL = redirectTargetURL;
-      expectedNotifyURL = redirectingURL;
       expectedNotifyStatus = 0;
 
-      p.streamTest(redirectingURL, false, null, writeCallback, notifyCallback, true);
+      p.streamTest(redirectingURL, false, null, writeCallback, notifyCallback, redirectCallback, true);
     }
 
     var tests = [test1, test2];
diff --git a/modules/plugin/test/mochitest/test_streamNotify.html b/modules/plugin/test/mochitest/test_streamNotify.html
index 64c2bafa9c94..ad9e248c805e 100644
--- a/modules/plugin/test/mochitest/test_streamNotify.html
+++ b/modules/plugin/test/mochitest/test_streamNotify.html
@@ -29,37 +29,37 @@
                       is(t.substr(0, 11), "Lorem ipsum",
                          "GET loremipsum.txt correct");
                       testDone();
-                    }, true), "streamTest GET");
+                    }, null, true), "streamTest GET");
 
     ok(!p.streamTest("post.sjs", true, null, null,
                      function(r, t) {
                        ok(false, "Shouldn't get callback from null post");
-                     }, true), "streamTest POST null postdata");
+                     }, null, true), "streamTest POST null postdata");
 
     ok(p.streamTest("post.sjs", true, "Something good", null,
                     function(r, t) {
                       is(r, 0, "POST something good");
                       is(t, "Something good", "POST non-null correct");
                       testDone();
-                    }, true), "streamTest POST valid postdata");
+                    }, null, true), "streamTest POST valid postdata");
 
     ok(p.streamTest("http://example.invalid/", false, null, null,
                     function(r, t) {
                       is(r, 1, "Shouldn't load example.invalid DNS name");
                       testDone();
-                    }, true), "streamTest GET bad DNS");
+                    }, null, true), "streamTest GET bad DNS");
 
     ok(!p.streamTest("http://localhost:-8/", false, null, null,
                     function(r, t) {
                       ok(false, "Shouldn't get callback from malformed URI");
-                    }, true), "streamTest GET invalid URL");
+                    }, null, true), "streamTest GET invalid URL");
 
     ok(p.streamTest("javascript:'Hello';", false, null, null,
                     function(r, t) {
                       is(r, 0, "GET javascript: URI");
                       is(t, "Hello", "GET javascript: URI correct");
                       testDone();
-                    }, true), "streamTest GET javascript: URI");
+                    }, null, true), "streamTest GET javascript: URI");
 
 /*
  * XXX/cjones: disabled for now because it appears to be hard to make
@@ -77,11 +77,11 @@
                       is(r, 0, "GET data: URI");
                       is(t, "World", "GET data: URI correct");
                       testDone();
-                    }, true), "streamTest GET data: URI");
+                    }, null, true), "streamTest GET data: URI");
 
     ok(!p.streamTest("data:malformed?", false, null, null,
                      function(r, t) {
                        todo(false, "Shouldn't get callback for invalid data: URI");
-                     }, true), "streamTest GET bad data: URI");
+                     }, null, true), "streamTest GET bad data: URI");
   }
   </script>
diff --git a/modules/plugin/test/mochitest/test_streamatclose.html b/modules/plugin/test/mochitest/test_streamatclose.html
index b9aa37531267..15c2c155cdc2 100644
--- a/modules/plugin/test/mochitest/test_streamatclose.html
+++ b/modules/plugin/test/mochitest/test_streamatclose.html
@@ -26,7 +26,7 @@
                     function(r, t) {
                       is(r, 2, "Stream should have failed");
                       urlnotified = true;
-                    }, true), "neverending.sjs started successfully");
+                    }, null, true), "neverending.sjs started successfully");
 
     setTimeout(removePlugin, 500);
   }
diff --git a/modules/plugin/test/testplugin/README b/modules/plugin/test/testplugin/README
index b0a2476e0572..c623d94a9d25 100644
--- a/modules/plugin/test/testplugin/README
+++ b/modules/plugin/test/testplugin/README
@@ -347,7 +347,7 @@ If the plugin is instantiated as a full-page plugin, the following defaults
 are used:
   streammode="seek" frame="testframe" range="100,100"
 
-The streamTest(url, doPost, postData, writeCallback, notifyCallback, allowRedirects)
+The streamTest(url, doPost, postData, writeCallback, notifyCallback, redirectCallback, allowRedirects)
 function will test how NPN_GetURLNotify and NPN_PostURLNotify behave when they are
 called with arbitrary (malformed) URLs. The function will return `true` if
 NPN_[Get/Post]URLNotify succeeds, and `false` if it fails.
@@ -356,6 +356,7 @@ NPN_[Get/Post]URLNotify succeeds, and `false` if it fails.
 @param postData null, or a string to send a postdata
 @writeCallback will be called when data is received for the stream
 @notifyCallback will be called when the urlnotify is received with the notify result
+@redirectCallback will be called from urlredirectnotify if a redirect is attempted
 @allowRedirects boolean value indicating whether or not to allow redirects
 
 == Internal consistency ==
diff --git a/modules/plugin/test/testplugin/nptest.cpp b/modules/plugin/test/testplugin/nptest.cpp
index 79b673df798f..7510cfd194d0 100644
--- a/modules/plugin/test/testplugin/nptest.cpp
+++ b/modules/plugin/test/testplugin/nptest.cpp
@@ -96,9 +96,6 @@ IntentionalCrash()
 static NPNetscapeFuncs* sBrowserFuncs = NULL;
 static NPClass sNPClass;
 
-static void
-testplugin_URLNotify(NPP instance, const char* url, NPReason reason,
-                     void* notifyData);
 void
 asyncCallback(void* cookie);
 
@@ -289,6 +286,7 @@ struct URLNotifyData
   const char* cookie;
   NPObject* writeCallback;
   NPObject* notifyCallback;
+  NPObject* redirectCallback;
   bool allowRedirects;
   uint32_t size;
   char* data;
@@ -590,7 +588,7 @@ static bool fillPluginFunctionTable(NPPluginFuncs* pFuncs)
   pFuncs->write = NPP_Write;
   pFuncs->print = NPP_Print;
   pFuncs->event = NPP_HandleEvent;
-  pFuncs->urlnotify = testplugin_URLNotify;
+  pFuncs->urlnotify = NPP_URLNotify;
   pFuncs->getvalue = NPP_GetValue;
   pFuncs->setvalue = NPP_SetValue;
   pFuncs->urlredirectnotify = NPP_URLRedirectNotify;
@@ -1249,7 +1247,7 @@ NPP_HandleEvent(NPP instance, void* event)
 }
 
 void
-testplugin_URLNotify(NPP instance, const char* url, NPReason reason, void* notifyData)
+NPP_URLNotify(NPP instance, const char* url, NPReason reason, void* notifyData)
 {
   InstanceData* instanceData = (InstanceData*)(instance->pdata);
   URLNotifyData* ndata = static_cast<URLNotifyData*>(notifyData);
@@ -1261,23 +1259,31 @@ testplugin_URLNotify(NPP instance, const char* url, NPReason reason, void* notif
     }
   }
   else if (!strcmp(ndata->cookie, "dynamic-cookie")) {
-    NPVariant args[2];
-    NPVariant result;
-    INT32_TO_NPVARIANT(reason, args[0]);
+    if (ndata->notifyCallback) {
+      NPVariant args[2];
+      INT32_TO_NPVARIANT(reason, args[0]);
+      if (ndata->data) {
+        STRINGN_TO_NPVARIANT(ndata->data, ndata->size, args[1]);
+      }
+      else {
+        STRINGN_TO_NPVARIANT("", 0, args[1]);
+      }
 
-    if (ndata->data)
-      STRINGN_TO_NPVARIANT(ndata->data, ndata->size, args[1]);
-    else
-      STRINGN_TO_NPVARIANT("", 0, args[1]);
-
-    NPN_InvokeDefault(instance, ndata->notifyCallback, args, 2, &result);
-    NPN_ReleaseVariantValue(&result);
+      NPVariant result;
+      NPN_InvokeDefault(instance, ndata->notifyCallback, args, 2, &result);
+      NPN_ReleaseVariantValue(&result);
+    }
 
     // clean up the URLNotifyData
     if (ndata->writeCallback) {
       NPN_ReleaseObject(ndata->writeCallback);
     }
-    NPN_ReleaseObject(ndata->notifyCallback);
+    if (ndata->notifyCallback) {
+      NPN_ReleaseObject(ndata->notifyCallback);
+    }
+    if (ndata->redirectCallback) {
+      NPN_ReleaseObject(ndata->redirectCallback);
+    }
     free(ndata->data);
     delete ndata;
   }
@@ -1321,8 +1327,17 @@ void
 NPP_URLRedirectNotify(NPP instance, const char* url, int32_t status, void* notifyData)
 {
   if (notifyData) {
-    NPN_URLRedirectResponse(instance, notifyData,
-                            static_cast<URLNotifyData*>(notifyData)->allowRedirects);
+    URLNotifyData* nd = static_cast<URLNotifyData*>(notifyData);
+    if (nd->redirectCallback) {
+      NPVariant args[2];
+      STRINGN_TO_NPVARIANT(url, strlen(url), args[0]);
+      INT32_TO_NPVARIANT(status, args[1]);
+
+      NPVariant result;
+      NPN_InvokeDefault(instance, nd->redirectCallback, args, 2, &result);
+      NPN_ReleaseVariantValue(&result);
+    }
+    NPN_URLRedirectResponse(instance, notifyData, nd->allowRedirects);
     return;
   }
   NPN_URLRedirectResponse(instance, notifyData, true);
@@ -2319,8 +2334,8 @@ convertPointY(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVaria
 static bool
 streamTest(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVariant* result)
 {
-  // .streamTest(url, doPost, doNull, writeCallback, notifyCallback, allowRedirects)
-  if (6 != argCount)
+  // .streamTest(url, doPost, doNull, writeCallback, notifyCallback, redirectCallback, allowRedirects)
+  if (7 != argCount)
     return false;
 
   NPP npp = static_cast<TestNPObject*>(npobj)->npp;
@@ -2334,37 +2349,54 @@ streamTest(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVariant*
   bool doPost = NPVARIANT_TO_BOOLEAN(args[1]);
 
   NPString postData = { NULL, 0 };
-  if (NPVARIANT_IS_NULL(args[2])) {
-  }
-  else if (NPVARIANT_IS_STRING(args[2])) {
+  if (NPVARIANT_IS_STRING(args[2])) {
     postData = NPVARIANT_TO_STRING(args[2]);
   }
   else {
-    return false;
+    if (!NPVARIANT_IS_NULL(args[2])) {
+      return false;
+    }
   }
 
   NPObject* writeCallback = NULL;
-  if (NPVARIANT_IS_NULL(args[3])) {
-  }
-  else if (NPVARIANT_IS_OBJECT(args[3])) {
+  if (NPVARIANT_IS_OBJECT(args[3])) {
     writeCallback = NPVARIANT_TO_OBJECT(args[3]);
   }
   else {
-    return false;
+    if (!NPVARIANT_IS_NULL(args[3])) {
+      return false;
+    }
   }
 
-  if (!NPVARIANT_IS_OBJECT(args[4]))
-    return false;
-  NPObject* notifyCallback = NPVARIANT_TO_OBJECT(args[4]);
+  NPObject* notifyCallback = NULL;
+  if (NPVARIANT_IS_OBJECT(args[4])) {
+    notifyCallback = NPVARIANT_TO_OBJECT(args[4]);
+  }
+  else {
+    if (!NPVARIANT_IS_NULL(args[4])) {
+      return false;
+    }
+  }
 
-  if (!NPVARIANT_IS_BOOLEAN(args[5]))
+  NPObject* redirectCallback = NULL;
+  if (NPVARIANT_IS_OBJECT(args[5])) {
+    redirectCallback = NPVARIANT_TO_OBJECT(args[5]);
+  }
+  else {
+    if (!NPVARIANT_IS_NULL(args[5])) {
+      return false;
+    }
+  }
+
+  if (!NPVARIANT_IS_BOOLEAN(args[6]))
     return false;
-  bool allowRedirects = NPVARIANT_TO_BOOLEAN(args[5]);
+  bool allowRedirects = NPVARIANT_TO_BOOLEAN(args[6]);
 
   URLNotifyData* ndata = new URLNotifyData;
   ndata->cookie = "dynamic-cookie";
   ndata->writeCallback = writeCallback;
   ndata->notifyCallback = notifyCallback;
+  ndata->redirectCallback = redirectCallback;
   ndata->size = 0;
   ndata->data = NULL;
   ndata->allowRedirects = allowRedirects;
@@ -2390,7 +2422,12 @@ streamTest(NPObject* npobj, const NPVariant* args, uint32_t argCount, NPVariant*
     if (ndata->writeCallback) {
       NPN_RetainObject(ndata->writeCallback);
     }
-    NPN_RetainObject(ndata->notifyCallback);
+    if (ndata->notifyCallback) {
+      NPN_RetainObject(ndata->notifyCallback);
+    }
+    if (ndata->redirectCallback) {
+      NPN_RetainObject(ndata->redirectCallback);
+    }
     BOOLEAN_TO_NPVARIANT(true, *result);
   }
   else {