diff --git a/lib/browser/index.js b/lib/browser/index.js
index 8caff788..693f108b 100644
--- a/lib/browser/index.js
+++ b/lib/browser/index.js
@@ -187,7 +187,8 @@ Object.defineProperties(Realm, {
         },
     },
     _waitForDownload: {
-        value: function(_config, callback) {
+        value: function(_config, sessionCallback, callback) {
+            sessionCallback();
             callback();
         }
     },
diff --git a/lib/browser/session.js b/lib/browser/session.js
index 34b51261..2308d8b1 100644
--- a/lib/browser/session.js
+++ b/lib/browser/session.js
@@ -22,7 +22,9 @@ import { keys, objectTypes } from './constants';
 import { getterForProperty, createMethods } from './util';
 import { deserialize } from './rpc';
 
-export default class Session { }
+export default class Session { 
+    
+}
 
 Object.defineProperties(Session.prototype, {
     url: { get: getterForProperty('url') },
@@ -31,7 +33,9 @@ Object.defineProperties(Session.prototype, {
 
 createMethods(Session.prototype, objectTypes.SESSION, [
     '_refreshAccessToken',
-    '_simulateError'
+    '_simulateError',
+    'addProgressNotification',
+    'removeProgressNotification'
 ]);
 
 export function createSession(realmId, info) {