diff --git a/src/rpc/channels.ts b/src/rpc/channels.ts
index 9480ca08e0..e576346ec5 100644
--- a/src/rpc/channels.ts
+++ b/src/rpc/channels.ts
@@ -33,6 +33,7 @@ export type BrowserTypeInitializer = {
   name: string
 };
 
+
 export interface BrowserChannel extends Channel {
   close(): Promise<void>;
   newContext(params: { options?: types.BrowserContextOptions }): Promise<BrowserContextChannel>;
@@ -40,6 +41,7 @@ export interface BrowserChannel extends Channel {
 }
 export type BrowserInitializer = {};
 
+
 export interface BrowserContextChannel extends Channel {
   addCookies(params: { cookies: types.SetNetworkCookieParam[] }): Promise<void>;
   addInitScript(params: { source: string }): Promise<void>;
@@ -59,17 +61,23 @@ export interface BrowserContextChannel extends Channel {
   setOffline(params: { offline: boolean }): Promise<void>;
   waitForEvent(params: { event: string }): Promise<any>;
 }
-export type BrowserContextInitializer = {};
+export type BrowserContextInitializer = {
+  pages: PageChannel[]
+};
+
 
 export interface PageChannel extends Channel {
   on(event: 'bindingCall', callback: (params: BindingCallChannel) => void): this;
   on(event: 'close', callback: () => void): this;
   on(event: 'console', callback: (params: ConsoleMessageChannel) => void): this;
+  on(event: 'dialog', callback: (params: DialogChannel) => void): this;
+  on(event: 'download', callback: (params: DownloadChannel) => void): this;
   on(event: 'frameAttached', callback: (params: FrameChannel) => void): this;
   on(event: 'frameDetached', callback: (params: FrameChannel) => void): this;
   on(event: 'frameNavigated', callback: (params: { frame: FrameChannel, url: string, name: string }) => void): this;
   on(event: 'frameNavigated', callback: (params: { frame: FrameChannel, url: string, name: string }) => void): this;
   on(event: 'pageError', callback: (params: { error: types.Error }) => void): this;
+  on(event: 'popup', callback: (params: PageChannel) => void): this;
   on(event: 'request', callback: (params: RequestChannel) => void): this;
   on(event: 'requestFailed', callback: (params: { request: RequestChannel, failureText: string | null }) => void): this;
   on(event: 'requestFinished', callback: (params: RequestChannel) => void): this;
@@ -112,6 +120,7 @@ export type PageInitializer = {
   viewportSize: types.Size | null
 };
 
+
 export interface FrameChannel extends Channel {
   $$eval(params: { selector: string; expression: string, isFunction: boolean, arg: any }): Promise<any>;
   $eval(params: { selector: string; expression: string, isFunction: boolean, arg: any }): Promise<any>;
@@ -153,6 +162,7 @@ export type FrameInitializer = {
   parentFrame: FrameChannel | null
 };
 
+
 export interface JSHandleChannel extends Channel {
   dispose(): Promise<void>;
   evaluateExpression(params: { expression: string, isFunction: boolean, arg: any }): Promise<any>;
@@ -164,6 +174,7 @@ export type JSHandleInitializer = {
   preview: string,
 };
 
+
 export interface ElementHandleChannel extends JSHandleChannel {
   $$eval(params: { selector: string; expression: string, isFunction: boolean, arg: any }): Promise<any>;
   $eval(params: { selector: string; expression: string, isFunction: boolean, arg: any }): Promise<any>;
@@ -193,6 +204,7 @@ export interface ElementHandleChannel extends JSHandleChannel {
   uncheck(params: { options?: types.TimeoutOptions & { force?: boolean } & { noWaitAfter?: boolean } }): Promise<void>;
 }
 
+
 export interface RequestChannel extends Channel {
   response(): Promise<ResponseChannel | null>;
 }
@@ -207,6 +219,7 @@ export type RequestInitializer = {
   redirectedFrom: RequestChannel | null,
 };
 
+
 export interface RouteChannel extends Channel {
   abort(params: { errorCode: string }): Promise<void>;
   continue(params: { overrides: { method?: string, headers?: types.Headers, postData?: string } }): Promise<void>;
@@ -216,6 +229,7 @@ export type RouteInitializer = {
   request: RequestChannel,
 };
 
+
 export interface ResponseChannel extends Channel {
   body(): Promise<Buffer>;
   finished(): Promise<Error | null>;
@@ -228,6 +242,7 @@ export type ResponseInitializer = {
   headers: types.Headers,
 };
 
+
 export interface ConsoleMessageChannel extends Channel {
 }
 export type ConsoleMessageInitializer = {
@@ -237,6 +252,7 @@ export type ConsoleMessageInitializer = {
   location: types.ConsoleMessageLocation,
 };
 
+
 export interface BindingCallChannel extends Channel {
   reject(params: { error: types.Error }): void;
   resolve(params: { result: any }): void;
@@ -246,3 +262,25 @@ export type BindingCallInitializer = {
   name: string,
   args: any[]
 };
+
+
+export interface DialogChannel extends Channel {
+  accept(params: { promptText?: string }): Promise<void>;
+  dismiss(): Promise<void>;
+}
+export type DialogInitializer = {
+	type: string,
+  message: string,
+  defaultValue: string,
+};
+
+
+export interface DownloadChannel extends Channel {
+  path(): Promise<string>;
+  failure(): Promise<string | null>;
+  delete(): Promise<void>;
+}
+export type DownloadInitializer = {
+	url: string,
+  suggestedFilename: string,
+};
diff --git a/src/rpc/client/browser.ts b/src/rpc/client/browser.ts
index 898d25c3cf..d16e32316f 100644
--- a/src/rpc/client/browser.ts
+++ b/src/rpc/client/browser.ts
@@ -50,7 +50,10 @@ export class Browser extends ChannelOwner<BrowserChannel, BrowserInitializer> {
   }
 
   async newPage(options?: types.BrowserContextOptions): Promise<Page> {
-    return Page.from(await this._channel.newPage({ options }));
+    const context = await this.newContext(options);
+    const page = await context.newPage();
+    page._ownedContext = context;
+    return page;
   }
 
   isConnected(): boolean {
diff --git a/src/rpc/client/browserContext.ts b/src/rpc/client/browserContext.ts
index d24e5675e7..856841f4b1 100644
--- a/src/rpc/client/browserContext.ts
+++ b/src/rpc/client/browserContext.ts
@@ -42,6 +42,11 @@ export class BrowserContext extends ChannelOwner<BrowserContextChannel, BrowserC
 
   constructor(connection: Connection, channel: BrowserContextChannel, initializer: BrowserContextInitializer) {
     super(connection, channel, initializer);
+    initializer.pages.map(p => {
+      const page = Page.from(p);
+      this._pages.add(page);
+      page._browserContext = this;
+    });
     channel.on('page', page => this._onPage(Page.from(page)));
   }
 
@@ -162,7 +167,8 @@ export class BrowserContext extends ChannelOwner<BrowserContextChannel, BrowserC
 
   async close(): Promise<void> {
     await this._channel.close();
-    this._browser!._contexts.delete(this);
+    if (this._browser)
+      this._browser._contexts.delete(this);
     this.emit(Events.BrowserContext.Close);
   }
 }
diff --git a/src/rpc/client/dialog.ts b/src/rpc/client/dialog.ts
new file mode 100644
index 0000000000..bfdc99f213
--- /dev/null
+++ b/src/rpc/client/dialog.ts
@@ -0,0 +1,49 @@
+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { DialogChannel, DialogInitializer } from '../channels';
+import { Connection } from '../connection';
+import { ChannelOwner } from './channelOwner';
+
+export class Dialog extends ChannelOwner<DialogChannel, DialogInitializer> {
+  static from(request: DialogChannel): Dialog {
+    return request._object;
+  }
+
+  constructor(connection: Connection, channel: DialogChannel, initializer: DialogInitializer) {
+    super(connection, channel, initializer);
+  }
+
+  type(): string {
+    return this._initializer.type;
+  }
+
+  message(): string {
+    return this._initializer.message;
+  }
+
+  defaultValue(): string {
+    return this._initializer.defaultValue;
+  }
+
+  async accept(promptText: string | undefined) {
+    await this._channel.accept({ promptText });
+  }
+
+  async dismiss() {
+    await this._channel.dismiss();
+  }
+}
diff --git a/src/rpc/client/download.ts b/src/rpc/client/download.ts
new file mode 100644
index 0000000000..f52f6ba4ed
--- /dev/null
+++ b/src/rpc/client/download.ts
@@ -0,0 +1,56 @@
+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as fs from 'fs';
+import { DownloadChannel, DownloadInitializer } from '../channels';
+import { Connection } from '../connection';
+import { ChannelOwner } from './channelOwner';
+import { Readable } from 'stream';
+
+export class Download extends ChannelOwner<DownloadChannel, DownloadInitializer> {
+  static from(request: DownloadChannel): Download {
+    return request._object;
+  }
+
+  constructor(connection: Connection, channel: DownloadChannel, initializer: DownloadInitializer) {
+    super(connection, channel, initializer);
+  }
+
+  url(): string {
+    return this._initializer.url;
+  }
+
+  suggestedFilename(): string {
+    return this._initializer.suggestedFilename;
+  }
+
+  async path(): Promise<string | null> {
+    return this._channel.path();
+  }
+
+  async failure(): Promise<string | null> {
+    return this._channel.failure();
+  }
+
+  async createReadStream(): Promise<Readable | null> {
+    const fileName = await this.path();
+    return fileName ? fs.createReadStream(fileName) : null;
+  }
+
+  async delete(): Promise<void> {
+    return this._channel.delete();
+  }
+}
diff --git a/src/rpc/client/frame.ts b/src/rpc/client/frame.ts
index 2031319432..167c79040c 100644
--- a/src/rpc/client/frame.ts
+++ b/src/rpc/client/frame.ts
@@ -37,7 +37,7 @@ export class Frame extends ChannelOwner<FrameChannel, FrameInitializer> {
   _parentFrame: Frame | null = null;
   _url = '';
   _name = '';
-  private _detached = false;
+  _detached = false;
   _childFrames = new Set<Frame>();
   _page: Page | undefined;
 
diff --git a/src/rpc/client/page.ts b/src/rpc/client/page.ts
index 6e88d02a7a..1a7830ce67 100644
--- a/src/rpc/client/page.ts
+++ b/src/rpc/client/page.ts
@@ -30,11 +30,15 @@ import { Connection } from '../connection';
 import { Keyboard, Mouse } from './input';
 import { Accessibility } from './accessibility';
 import { ConsoleMessage } from './consoleMessage';
+import { Dialog } from './dialog';
+import { Download } from './download';
 
 export class Page extends ChannelOwner<PageChannel, PageInitializer> {
   readonly pdf: ((options?: types.PDFOptions) => Promise<Buffer>) | undefined;
 
   _browserContext: BrowserContext | undefined;
+  _ownedContext: BrowserContext | undefined;
+
   private _mainFrame: Frame;
   private _frames = new Set<Frame>();
   private _workers: Worker[] = [];
@@ -69,10 +73,13 @@ export class Page extends ChannelOwner<PageChannel, PageInitializer> {
     this._channel.on('bindingCall', bindingCall => this._onBinding(BindingCall.from(bindingCall)));
     this._channel.on('close', () => this._onClose());
     this._channel.on('console', message => this.emit(Events.Page.Console, ConsoleMessage.from(message)));
+    this._channel.on('dialog', dialog => this.emit(Events.Page.Dialog, Dialog.from(dialog)));
+    this._channel.on('download', download => this.emit(Events.Page.Download, Download.from(download)));
     this._channel.on('frameAttached', frame => this._onFrameAttached(Frame.from(frame)));
     this._channel.on('frameDetached', frame => this._onFrameDetached(Frame.from(frame)));
     this._channel.on('frameNavigated', ({ frame, url, name }) => this._onFrameNavigated(Frame.from(frame), url, name));
     this._channel.on('pageError', ({ error }) => this.emit(Events.Page.PageError, parseError(error)));
+    this._channel.on('popup', popup => this.emit(Events.Page.Popup, Page.from(popup)));
     this._channel.on('request', request => this.emit(Events.Page.Request, Request.from(request)));
     this._channel.on('requestFailed', ({ request, failureText }) => this._onRequestFailed(Request.from(request), failureText));
     this._channel.on('requestFinished', request => this.emit(Events.Page.RequestFinished, Request.from(request)));
@@ -95,6 +102,7 @@ export class Page extends ChannelOwner<PageChannel, PageInitializer> {
 
   private _onFrameDetached(frame: Frame) {
     this._frames.delete(frame);
+    frame._detached = true;
     if (frame._parentFrame)
       frame._parentFrame._childFrames.delete(frame);
     this.emit(Events.Page.FrameDetached, frame);
@@ -329,6 +337,8 @@ export class Page extends ChannelOwner<PageChannel, PageInitializer> {
 
   async close(options: { runBeforeUnload?: boolean } = {runBeforeUnload: undefined}) {
     await this._channel.close({ options });
+    if (this._ownedContext)
+      await this._ownedContext.close();
   }
 
   isClosed(): boolean {
diff --git a/src/rpc/connection.ts b/src/rpc/connection.ts
index a3b5c18873..cab2bb2187 100644
--- a/src/rpc/connection.ts
+++ b/src/rpc/connection.ts
@@ -27,6 +27,8 @@ import { Page, BindingCall } from './client/page';
 import debug = require('debug');
 import { Channel } from './channels';
 import { ConsoleMessage } from './client/consoleMessage';
+import { Dialog } from './client/dialog';
+import { Download } from './client/download';
 
 export class Connection {
   private _channels = new Map<string, Channel>();
@@ -41,21 +43,39 @@ export class Connection {
     let result: ChannelOwner<any, any>;
     initializer = this._replaceGuidsWithChannels(initializer);
     switch (type) {
-      case 'browserType':
-        result = new BrowserType(this, channel, initializer);
+      case 'bindingCall':
+        result = new BindingCall(this, channel, initializer);
         break;
       case 'browser':
         result = new Browser(this, channel, initializer);
         break;
+      case 'browserType':
+        result = new BrowserType(this, channel, initializer);
+        break;
       case 'context':
         result = new BrowserContext(this, channel, initializer);
         break;
-      case 'page':
-        result = new Page(this, channel, initializer);
+      case 'consoleMessage':
+        result = new ConsoleMessage(this, channel, initializer);
+        break;
+      case 'dialog':
+        result = new Dialog(this, channel, initializer);
+        break;
+      case 'download':
+        result = new Download(this, channel, initializer);
+        break;
+      case 'elementHandle':
+        result = new ElementHandle(this, channel, initializer);
         break;
       case 'frame':
         result = new Frame(this, channel, initializer);
         break;
+      case 'jsHandle':
+        result = new JSHandle(this, channel, initializer);
+        break;
+      case 'page':
+        result = new Page(this, channel, initializer);
+        break;
       case 'request':
         result = new Request(this, channel, initializer);
         break;
@@ -65,18 +85,6 @@ export class Connection {
       case 'route':
         result = new Route(this, channel, initializer);
         break;
-      case 'bindingCall':
-        result = new BindingCall(this, channel, initializer);
-        break;
-      case 'jsHandle':
-        result = new JSHandle(this, channel, initializer);
-        break;
-      case 'elementHandle':
-        result = new ElementHandle(this, channel, initializer);
-        break;
-      case 'consoleMessage':
-        result = new ConsoleMessage(this, channel, initializer);
-        break;
       default:
         throw new Error('Missing type ' + type);
     }
@@ -150,8 +158,12 @@ export class Connection {
     // TODO: send base64
     if (payload instanceof Buffer)
       return payload;
-    if (typeof payload === 'object')
-      return Object.fromEntries([...Object.entries(payload)].map(([n,v]) => [n, this._replaceChannelsWithGuids(v)]));
+    if (typeof payload === 'object') {
+      const result: any = {};
+      for (const key of Object.keys(payload))
+        result[key] = this._replaceChannelsWithGuids(payload[key]);
+      return result;
+    }
     return payload;
   }
 
@@ -165,8 +177,12 @@ export class Connection {
     // TODO: send base64
     if (payload instanceof Buffer)
       return payload;
-    if (typeof payload === 'object')
-      return Object.fromEntries([...Object.entries(payload)].map(([n,v]) => [n, this._replaceGuidsWithChannels(v)]));
+    if (typeof payload === 'object') {
+      const result: any = {};
+      for (const key of Object.keys(payload))
+        result[key] = this._replaceGuidsWithChannels(payload[key]);
+      return result;
+    }
     return payload;
   }
 }
diff --git a/src/rpc/dispatcher.ts b/src/rpc/dispatcher.ts
index 1c5b450a49..8aad1880e2 100644
--- a/src/rpc/dispatcher.ts
+++ b/src/rpc/dispatcher.ts
@@ -18,30 +18,30 @@ import { EventEmitter } from 'events';
 import { helper } from '../helper';
 import { Channel } from './channels';
 
-export class Dispatcher<Initializer> extends EventEmitter implements Channel {
+export class Dispatcher<Type, Initializer> extends EventEmitter implements Channel {
   readonly _guid: string;
   readonly _type: string;
   protected _scope: DispatcherScope;
   _object: any;
 
-  constructor(scope: DispatcherScope, object: any, type: string, initializer: Initializer, guid = type + '@' + helper.guid()) {
+  constructor(scope: DispatcherScope, object: Type, type: string, initializer: Initializer, guid = type + '@' + helper.guid()) {
     super();
     this._type = type;
     this._guid = guid;
     this._object = object;
     this._scope = scope;
     scope.dispatchers.set(this._guid, this);
-    object[scope.dispatcherSymbol] = this;
+    (object as any)[scope.dispatcherSymbol] = this;
     this._scope.sendMessageToClient(this._guid, '__create__', { type, initializer });
   }
 
-  _dispatchEvent(method: string, params: Dispatcher<any> | any = {}) {
+  _dispatchEvent(method: string, params: Dispatcher<any, any> | any = {}) {
     this._scope.sendMessageToClient(this._guid, method, params);
   }
 }
 
 export class DispatcherScope {
-  readonly dispatchers = new Map<string, Dispatcher<any>>();
+  readonly dispatchers = new Map<string, Dispatcher<any, any>>();
   readonly dispatcherSymbol = Symbol('dispatcher');
   sendMessageToClientTransport = (message: any) => {};
 
@@ -65,8 +65,12 @@ export class DispatcherScope {
     // TODO: send base64
     if (payload instanceof Buffer)
       return payload;
-    if (typeof payload === 'object')
-      return Object.fromEntries([...Object.entries(payload)].map(([n,v]) => [n, this._replaceDispatchersWithGuids(v)]));
+    if (typeof payload === 'object') {
+      const result: any = {};
+      for (const key of Object.keys(payload))
+        result[key] = this._replaceDispatchersWithGuids(payload[key]);
+      return result;
+    }
     return payload;
   }
 
@@ -80,8 +84,12 @@ export class DispatcherScope {
     // TODO: send base64
     if (payload instanceof Buffer)
       return payload;
-    if (typeof payload === 'object')
-      return Object.fromEntries([...Object.entries(payload)].map(([n,v]) => [n, this._replaceGuidsWithDispatchers(v)]));
+    if (typeof payload === 'object') {
+      const result: any = {};
+      for (const key of Object.keys(payload))
+        result[key] = this._replaceGuidsWithDispatchers(payload[key]);
+      return result;
+    }
     return payload;
   }
 }
diff --git a/src/rpc/server/browserContextDispatcher.ts b/src/rpc/server/browserContextDispatcher.ts
index 5a5c45d5cb..a1587e1ebb 100644
--- a/src/rpc/server/browserContextDispatcher.ts
+++ b/src/rpc/server/browserContextDispatcher.ts
@@ -23,9 +23,8 @@ import { PageChannel, BrowserContextChannel, BrowserContextInitializer } from '.
 import { RouteDispatcher, RequestDispatcher } from './networkDispatchers';
 import { Page } from '../../page';
 
-export class BrowserContextDispatcher extends Dispatcher<BrowserContextInitializer> implements BrowserContextChannel {
+export class BrowserContextDispatcher extends Dispatcher<BrowserContext, BrowserContextInitializer> implements BrowserContextChannel {
   private _context: BrowserContextBase;
-
   static from(scope: DispatcherScope, browserContext: BrowserContext): BrowserContextDispatcher {
     if ((browserContext as any)[scope.dispatcherSymbol])
       return (browserContext as any)[scope.dispatcherSymbol];
@@ -33,7 +32,9 @@ export class BrowserContextDispatcher extends Dispatcher<BrowserContextInitializ
   }
 
   constructor(scope: DispatcherScope, context: BrowserContextBase) {
-    super(scope, context, 'context', {});
+    super(scope, context, 'context', {
+      pages: context.pages().map(p => PageDispatcher.from(scope, p))
+    });
     this._context = context;
     context.on(Events.BrowserContext.Page, page => this._dispatchEvent('page', PageDispatcher.from(this._scope, page)));
     context.on(Events.BrowserContext.Close, () => {
diff --git a/src/rpc/server/browserDispatcher.ts b/src/rpc/server/browserDispatcher.ts
index 53ccaf3a18..75a1bc2664 100644
--- a/src/rpc/server/browserDispatcher.ts
+++ b/src/rpc/server/browserDispatcher.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { BrowserBase } from '../../browser';
+import { BrowserBase, Browser } from '../../browser';
 import { BrowserContextBase } from '../../browserContext';
 import * as types from '../../types';
 import { BrowserContextDispatcher } from './browserContextDispatcher';
@@ -22,9 +22,7 @@ import { BrowserChannel, BrowserContextChannel, PageChannel, BrowserInitializer
 import { Dispatcher, DispatcherScope } from '../dispatcher';
 import { PageDispatcher } from './pageDispatcher';
 
-export class BrowserDispatcher extends Dispatcher<BrowserInitializer> implements BrowserChannel {
-  private _browser: BrowserBase;
-
+export class BrowserDispatcher extends Dispatcher<Browser, BrowserInitializer> implements BrowserChannel {
   static from(scope: DispatcherScope, browser: BrowserBase): BrowserDispatcher {
     if ((browser as any)[scope.dispatcherSymbol])
       return (browser as any)[scope.dispatcherSymbol];
@@ -39,18 +37,17 @@ export class BrowserDispatcher extends Dispatcher<BrowserInitializer> implements
 
   constructor(scope: DispatcherScope, browser: BrowserBase) {
     super(scope, browser, 'browser', {});
-    this._browser = browser;
   }
 
   async newContext(params: { options?: types.BrowserContextOptions }): Promise<BrowserContextChannel> {
-    return BrowserContextDispatcher.from(this._scope, await this._browser.newContext(params.options) as BrowserContextBase);
+    return BrowserContextDispatcher.from(this._scope, await this._object.newContext(params.options) as BrowserContextBase);
   }
 
   async newPage(params: { options?: types.BrowserContextOptions }): Promise<PageChannel> {
-    return PageDispatcher.from(this._scope, await this._browser.newPage(params.options));
+    return PageDispatcher.from(this._scope, await this._object.newPage(params.options));
   }
 
   async close(): Promise<void> {
-    await this._browser.close();
+    await this._object.close();
   }
 }
diff --git a/src/rpc/server/browserTypeDispatcher.ts b/src/rpc/server/browserTypeDispatcher.ts
index 0e29bdba02..ce484a98f8 100644
--- a/src/rpc/server/browserTypeDispatcher.ts
+++ b/src/rpc/server/browserTypeDispatcher.ts
@@ -15,7 +15,7 @@
  */
 
 import { BrowserBase } from '../../browser';
-import { BrowserTypeBase } from '../../server/browserType';
+import { BrowserTypeBase, BrowserType } from '../../server/browserType';
 import * as types from '../../types';
 import { BrowserDispatcher } from './browserDispatcher';
 import { BrowserChannel, BrowserTypeChannel, BrowserContextChannel, BrowserTypeInitializer } from '../channels';
@@ -23,9 +23,7 @@ import { Dispatcher, DispatcherScope } from '../dispatcher';
 import { BrowserContextBase } from '../../browserContext';
 import { BrowserContextDispatcher } from './browserContextDispatcher';
 
-export class BrowserTypeDispatcher extends Dispatcher<BrowserTypeInitializer> implements BrowserTypeChannel {
-  private _browserType: BrowserTypeBase;
-
+export class BrowserTypeDispatcher extends Dispatcher<BrowserType, BrowserTypeInitializer> implements BrowserTypeChannel {
   static from(scope: DispatcherScope, browserType: BrowserTypeBase): BrowserTypeDispatcher {
     if ((browserType as any)[scope.dispatcherSymbol])
       return (browserType as any)[scope.dispatcherSymbol];
@@ -37,21 +35,20 @@ export class BrowserTypeDispatcher extends Dispatcher<BrowserTypeInitializer> im
       executablePath: browserType.executablePath(),
       name: browserType.name()
     }, browserType.name());
-    this._browserType = browserType;
   }
 
   async launch(params: { options?: types.LaunchOptions }): Promise<BrowserChannel> {
-    const browser = await this._browserType.launch(params.options || undefined);
+    const browser = await this._object.launch(params.options || undefined);
     return BrowserDispatcher.from(this._scope, browser as BrowserBase);
   }
 
   async launchPersistentContext(params: { userDataDir: string, options?: types.LaunchOptions & types.BrowserContextOptions }): Promise<BrowserContextChannel> {
-    const browserContext = await this._browserType.launchPersistentContext(params.userDataDir, params.options);
+    const browserContext = await this._object.launchPersistentContext(params.userDataDir, params.options);
     return BrowserContextDispatcher.from(this._scope, browserContext as BrowserContextBase);
   }
 
   async connect(params: { options: types.ConnectOptions }): Promise<BrowserChannel> {
-    const browser = await this._browserType.connect(params.options);
+    const browser = await this._object.connect(params.options);
     return BrowserDispatcher.from(this._scope, browser as BrowserBase);
   }
 }
diff --git a/src/rpc/server/consoleMessageDispatcher.ts b/src/rpc/server/consoleMessageDispatcher.ts
index 88a630f729..0a3156cec7 100644
--- a/src/rpc/server/consoleMessageDispatcher.ts
+++ b/src/rpc/server/consoleMessageDispatcher.ts
@@ -19,7 +19,7 @@ import { ConsoleMessageChannel, ConsoleMessageInitializer } from '../channels';
 import { Dispatcher, DispatcherScope } from '../dispatcher';
 import { ElementHandleDispatcher } from './elementHandlerDispatcher';
 
-export class ConsoleMessageDispatcher extends Dispatcher<ConsoleMessageInitializer> implements ConsoleMessageChannel {
+export class ConsoleMessageDispatcher extends Dispatcher<ConsoleMessage, ConsoleMessageInitializer> implements ConsoleMessageChannel {
   static from(scope: DispatcherScope, message: ConsoleMessage): ConsoleMessageDispatcher {
     if ((message as any)[scope.dispatcherSymbol])
       return (message as any)[scope.dispatcherSymbol];
diff --git a/src/rpc/server/dialogDispatcher.ts b/src/rpc/server/dialogDispatcher.ts
new file mode 100644
index 0000000000..8ae9001fad
--- /dev/null
+++ b/src/rpc/server/dialogDispatcher.ts
@@ -0,0 +1,43 @@
+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the 'License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Dialog } from '../../dialog';
+import { DialogChannel, DialogInitializer } from '../channels';
+import { Dispatcher, DispatcherScope } from '../dispatcher';
+
+export class DialogDispatcher extends Dispatcher<Dialog, DialogInitializer> implements DialogChannel {
+  static from(scope: DispatcherScope, dialog: Dialog): DialogDispatcher {
+    if ((dialog as any)[scope.dispatcherSymbol])
+      return (dialog as any)[scope.dispatcherSymbol];
+    return new DialogDispatcher(scope, dialog);
+  }
+
+  constructor(scope: DispatcherScope, dialog: Dialog) {
+    super(scope, dialog, 'dialog', {
+      type: dialog.type(),
+      message: dialog.message(),
+      defaultValue: dialog.defaultValue(),
+    });
+  }
+
+  async accept(params: { promptText?: string }): Promise<void> {
+    await this._object.accept(params.promptText);
+  }
+
+  async dismiss(): Promise<void> {
+    await this._object.dismiss();
+  }
+}
diff --git a/src/rpc/server/downloadDispatcher.ts b/src/rpc/server/downloadDispatcher.ts
new file mode 100644
index 0000000000..a313b8c9d6
--- /dev/null
+++ b/src/rpc/server/downloadDispatcher.ts
@@ -0,0 +1,46 @@
+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the 'License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Download } from '../../download';
+import { DownloadChannel, DownloadInitializer } from '../channels';
+import { Dispatcher, DispatcherScope } from '../dispatcher';
+
+export class DownloadDispatcher extends Dispatcher<Download, DownloadInitializer> implements DownloadChannel {
+  static from(scope: DispatcherScope, Download: Download): DownloadDispatcher {
+    if ((Download as any)[scope.dispatcherSymbol])
+      return (Download as any)[scope.dispatcherSymbol];
+    return new DownloadDispatcher(scope, Download);
+  }
+
+  constructor(scope: DispatcherScope, download: Download) {
+    super(scope, download, 'download', {
+      url: download.url(),
+      suggestedFilename: download.suggestedFilename(),
+    });
+  }
+
+  async path(): Promise<string> {
+    return this._object.path();
+  }
+
+  async failure(): Promise<string | null> {
+    return this._object.failure();
+  }
+
+  async delete(): Promise<void> {
+    await this._object.delete();
+  }
+}
diff --git a/src/rpc/server/frameDispatcher.ts b/src/rpc/server/frameDispatcher.ts
index 4104eeffef..a659c06c78 100644
--- a/src/rpc/server/frameDispatcher.ts
+++ b/src/rpc/server/frameDispatcher.ts
@@ -22,7 +22,7 @@ import { ElementHandleDispatcher, convertSelectOptionValues } from './elementHan
 import { JSHandleDispatcher } from './jsHandleDispatcher';
 import { ResponseDispatcher } from './networkDispatchers';
 
-export class FrameDispatcher extends Dispatcher<FrameInitializer> implements FrameChannel {
+export class FrameDispatcher extends Dispatcher<Frame, FrameInitializer> implements FrameChannel {
   private _frame: Frame;
 
   static from(scope: DispatcherScope, frame: Frame): FrameDispatcher {
diff --git a/src/rpc/server/jsHandleDispatcher.ts b/src/rpc/server/jsHandleDispatcher.ts
index e6175dba06..403322c7c7 100644
--- a/src/rpc/server/jsHandleDispatcher.ts
+++ b/src/rpc/server/jsHandleDispatcher.ts
@@ -19,27 +19,25 @@ import { JSHandleChannel, JSHandleInitializer } from '../channels';
 import { Dispatcher, DispatcherScope } from '../dispatcher';
 import { convertArg } from './frameDispatcher';
 
-export class JSHandleDispatcher extends Dispatcher<JSHandleInitializer> implements JSHandleChannel {
-  readonly _jsHandle: js.JSHandle<any>;
+export class JSHandleDispatcher extends Dispatcher<js.JSHandle, JSHandleInitializer> implements JSHandleChannel {
 
   constructor(scope: DispatcherScope, jsHandle: js.JSHandle) {
     super(scope, jsHandle, jsHandle.asElement() ? 'elementHandle' : 'jsHandle', {
       preview: jsHandle.toString(),
     });
-    this._jsHandle = jsHandle;
   }
 
   async evaluateExpression(params: { expression: string, isFunction: boolean, arg: any }): Promise<any> {
-    return this._jsHandle._evaluateExpression(params.expression, params.isFunction, true /* returnByValue */, convertArg(this._scope, params.arg));
+    return this._object._evaluateExpression(params.expression, params.isFunction, true /* returnByValue */, convertArg(this._scope, params.arg));
   }
 
   async evaluateExpressionHandle(params: { expression: string, isFunction: boolean, arg: any}): Promise<JSHandleChannel> {
-    const jsHandle = await this._jsHandle._evaluateExpression(params.expression, params.isFunction, false /* returnByValue */, convertArg(this._scope, params.arg));
+    const jsHandle = await this._object._evaluateExpression(params.expression, params.isFunction, false /* returnByValue */, convertArg(this._scope, params.arg));
     return new JSHandleDispatcher(this._scope, jsHandle);
   }
 
   async getPropertyList(): Promise<{ name: string, value: JSHandleChannel }[]> {
-    const map = await this._jsHandle.getProperties();
+    const map = await this._object.getProperties();
     const result = [];
     for (const [name, value] of map)
       result.push({ name, value: new JSHandleDispatcher(this._scope, value) });
@@ -47,10 +45,10 @@ export class JSHandleDispatcher extends Dispatcher<JSHandleInitializer> implemen
   }
 
   async jsonValue(): Promise<any> {
-    return this._jsHandle.jsonValue();
+    return this._object.jsonValue();
   }
 
   async dispose() {
-    await this._jsHandle.dispose();
+    await this._object.dispose();
   }
 }
diff --git a/src/rpc/server/networkDispatchers.ts b/src/rpc/server/networkDispatchers.ts
index fcb7a067c5..278e5ae531 100644
--- a/src/rpc/server/networkDispatchers.ts
+++ b/src/rpc/server/networkDispatchers.ts
@@ -20,9 +20,7 @@ import { RequestChannel, ResponseChannel, RouteChannel, ResponseInitializer, Req
 import { Dispatcher, DispatcherScope } from '../dispatcher';
 import { FrameDispatcher } from './frameDispatcher';
 
-export class RequestDispatcher extends Dispatcher<RequestInitializer> implements RequestChannel {
-  private _request: Request;
-
+export class RequestDispatcher extends Dispatcher<Request, RequestInitializer> implements RequestChannel {
   static from(scope: DispatcherScope, request: Request): RequestDispatcher {
     if ((request as any)[scope.dispatcherSymbol])
       return (request as any)[scope.dispatcherSymbol];
@@ -44,16 +42,14 @@ export class RequestDispatcher extends Dispatcher<RequestInitializer> implements
       isNavigationRequest: request.isNavigationRequest(),
       redirectedFrom: RequestDispatcher.fromNullable(scope, request.redirectedFrom()),
     });
-    this._request = request;
   }
 
   async response(): Promise<ResponseChannel | null> {
-    return ResponseDispatcher.fromNullable(this._scope, await this._request.response());
+    return ResponseDispatcher.fromNullable(this._scope, await this._object.response());
   }
 }
 
-export class ResponseDispatcher extends Dispatcher<ResponseInitializer> implements ResponseChannel {
-  private _response: Response;
+export class ResponseDispatcher extends Dispatcher<Response, ResponseInitializer> implements ResponseChannel {
 
   static from(scope: DispatcherScope, response: Response): ResponseDispatcher {
     if ((response as any)[scope.dispatcherSymbol])
@@ -73,20 +69,18 @@ export class ResponseDispatcher extends Dispatcher<ResponseInitializer> implemen
       statusText: response.statusText(),
       headers: response.headers(),
     });
-    this._response = response;
   }
 
   async finished(): Promise<Error | null> {
-    return await this._response.finished();
+    return await this._object.finished();
   }
 
   async body(): Promise<Buffer> {
-    return await this._response.body();
+    return await this._object.body();
   }
 }
 
-export class RouteDispatcher extends Dispatcher<RouteInitializer> implements RouteChannel {
-  private _route: Route;
+export class RouteDispatcher extends Dispatcher<Route, RouteInitializer> implements RouteChannel {
 
   static from(scope: DispatcherScope, route: Route): RouteDispatcher {
     if ((route as any)[scope.dispatcherSymbol])
@@ -102,18 +96,17 @@ export class RouteDispatcher extends Dispatcher<RouteInitializer> implements Rou
     super(scope, route, 'route', {
       request: RequestDispatcher.from(scope, route.request())
     });
-    this._route = route;
   }
 
   async continue(params: { overrides: { method?: string, headers?: types.Headers, postData?: string } }): Promise<void> {
-    await this._route.continue(params.overrides);
+    await this._object.continue(params.overrides);
   }
 
   async fulfill(params: { response: types.FulfillResponse & { path?: string } }): Promise<void> {
-    await this._route.fulfill(params.response);
+    await this._object.fulfill(params.response);
   }
 
   async abort(params: { errorCode: string }): Promise<void> {
-    await this._route.abort(params.errorCode);
+    await this._object.abort(params.errorCode);
   }
 }
diff --git a/src/rpc/server/pageDispatcher.ts b/src/rpc/server/pageDispatcher.ts
index 84f9ba1477..629c50c2e8 100644
--- a/src/rpc/server/pageDispatcher.ts
+++ b/src/rpc/server/pageDispatcher.ts
@@ -14,20 +14,22 @@
  * limitations under the License.
  */
 
+import { BrowserContext } from '../../browserContext';
 import { Events } from '../../events';
-import { Request } from '../../network';
 import { Frame } from '../../frames';
+import { parseError, serializeError } from '../../helper';
+import { Request } from '../../network';
 import { Page } from '../../page';
 import * as types from '../../types';
-import { ElementHandleChannel, PageChannel, ResponseChannel, BindingCallChannel, PageInitializer, BindingCallInitializer } from '../channels';
+import { BindingCallChannel, BindingCallInitializer, ElementHandleChannel, PageChannel, PageInitializer, ResponseChannel } from '../channels';
 import { Dispatcher, DispatcherScope } from '../dispatcher';
+import { ConsoleMessageDispatcher } from './consoleMessageDispatcher';
+import { DialogDispatcher } from './dialogDispatcher';
+import { DownloadDispatcher } from './downloadDispatcher';
 import { FrameDispatcher } from './frameDispatcher';
 import { RequestDispatcher, ResponseDispatcher, RouteDispatcher } from './networkDispatchers';
-import { ConsoleMessageDispatcher } from './consoleMessageDispatcher';
-import { BrowserContext } from '../../browserContext';
-import { serializeError, parseError } from '../../helper';
 
-export class PageDispatcher extends Dispatcher<PageInitializer> implements PageChannel {
+export class PageDispatcher extends Dispatcher<Page, PageInitializer> implements PageChannel {
   private _page: Page;
 
   static from(scope: DispatcherScope, page: Page): PageDispatcher {
@@ -50,10 +52,13 @@ export class PageDispatcher extends Dispatcher<PageInitializer> implements PageC
     this._page = page;
     page.on(Events.Page.Close, () => this._dispatchEvent('close'));
     page.on(Events.Page.Console, message => this._dispatchEvent('console', ConsoleMessageDispatcher.from(this._scope, message)));
+    page.on(Events.Page.Dialog, dialog => this._dispatchEvent('dialog', DialogDispatcher.from(this._scope, dialog)));
+    page.on(Events.Page.Download, dialog => this._dispatchEvent('download', DownloadDispatcher.from(this._scope, dialog)));
     page.on(Events.Page.FrameAttached, frame => this._onFrameAttached(frame));
     page.on(Events.Page.FrameDetached, frame => this._onFrameDetached(frame));
     page.on(Events.Page.FrameNavigated, frame => this._onFrameNavigated(frame));
     page.on(Events.Page.PageError, error => this._dispatchEvent('pageError', { error: serializeError(error) }));
+    page.on(Events.Page.Popup, page => this._dispatchEvent('popup', PageDispatcher.from(this._scope, page)));
     page.on(Events.Page.Request, request => this._dispatchEvent('request', RequestDispatcher.from(this._scope, request)));
     page.on(Events.Page.RequestFailed, (request: Request) => this._dispatchEvent('requestFailed', {
       request: RequestDispatcher.from(this._scope, request),
@@ -193,7 +198,7 @@ export class PageDispatcher extends Dispatcher<PageInitializer> implements PageC
 }
 
 
-export class BindingCallDispatcher extends Dispatcher<BindingCallInitializer> implements BindingCallChannel {
+export class BindingCallDispatcher extends Dispatcher<{}, BindingCallInitializer> implements BindingCallChannel {
   private _resolve: ((arg: any) => void) | undefined;
   private _reject: ((error: any) => void) | undefined;
   private _promise: Promise<any>;