chore: resore extension sources (#999)

.github/workflows/ci.yml

@@ -73,3 +73,41 @@ jobs:
         npm run test -- --project=chromium-docker
       env:
         MCP_IN_DOCKER: 1
+
+  test_extension:
+    strategy:
+      fail-fast: false
+    runs-on: macos-latest
+    defaults:
+      run:
+        working-directory: ./extension
+    steps:
+    - uses: actions/checkout@v4
+    - name: Use Node.js 20
+      uses: actions/setup-node@v4
+      with:
+        node-version: '20' # crypto.randomUUID(); stalls in v18.20.8
+        cache: 'npm'
+    - name: Install dependencies
+      run: npm ci
+    - name: Build extension
+      run: npm run build
+    - name: Upload artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: extension
+        path: ./extension/dist
+        retention-days: 7
+    - name: Install MCP server
+      run: |
+        cd ..
+        npm ci
+        npx playwright install chromium
+    - name: Run tests
+      run: |
+        if [[ "$(uname)" == "Linux" ]]; then
+          xvfb-run --auto-servernum --server-args="-screen 0 1280x960x24" -- npm run test
+        else
+          npm run test
+        fi
+      shell: bash

README.md

@@ -274,7 +274,7 @@ state [here](https://playwright.dev/docs/auth).
 
 **Browser Extension**
 
-The Playwright MCP Chrome Extension allows you to connect to existing browser tabs and leverage your logged-in sessions and browser state. See extension's [README.md](https://github.com/microsoft/playwright/blob/main/packages/mcp-extension/README.md) for installation and setup instructions.
+The Playwright MCP Chrome Extension allows you to connect to existing browser tabs and leverage your logged-in sessions and browser state. See [extension/README.md](extension/README.md) for installation and setup instructions.
 
 ### Configuration file
 

extension/README.md

@@ -0,0 +1,48 @@
+# Playwright MCP Chrome Extension
+
+## Introduction
+
+The Playwright MCP Chrome Extension allows you to connect to pages in your existing browser and leverage the state of your default user profile. This means the AI assistant can interact with websites where you're already logged in, using your existing cookies, sessions, and browser state, providing a seamless experience without requiring separate authentication or setup.
+
+## Prerequisites
+
+- Chrome/Edge/Chromium browser
+
+## Installation Steps
+
+### Download the Extension
+
+Download the latest Chrome extension from GitHub:
+- **Download link**: https://github.com/microsoft/playwright-mcp/releases
+
+### Load Chrome Extension
+
+1. Open Chrome and navigate to `chrome://extensions/`
+2. Enable "Developer mode" (toggle in the top right corner)
+3. Click "Load unpacked" and select the extension directory
+
+### Configure Playwright MCP server
+
+Configure Playwright MCP server to connect to the browser using the extension by passing the `--extension` option when running the MCP server:
+
+```json
+{
+  "mcpServers": {
+    "playwright-extension": {
+      "command": "npx",
+      "args": [
+        "@playwright/mcp@latest",
+        "--extension"
+      ]
+    }
+  }
+}
+```
+
+## Usage
+
+### Browser Tab Selection
+
+When the LLM interacts with the browser for the first time, it will load a page where you can select which browser tab the LLM will connect to. This allows you to control which specific page the AI assistant will interact with during the session.
+
+

extension/manifest.json

@@ -0,0 +1,35 @@
+{
+  "manifest_version": 3,
+  "name": "Playwright MCP Bridge",
+  "version": "0.0.36",
+  "description": "Share browser tabs with Playwright MCP server",
+  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA9nMS2b0WCohjVHPGb8D9qAdkbIngDqoAjTeSccHJijgcONejge+OJxOQOMLu7b0ovt1c9BiEJa5JcpM+EHFVGL1vluBxK71zmBy1m2f9vZF3HG0LSCp7YRkum9rAIEthDwbkxx6XTvpmAY5rjFa/NON6b9Hlbo+8peUSkoOK7HTwYnnI36asZ9eUTiveIf+DMPLojW2UX33vDWG2UKvMVDewzclb4+uLxAYshY7Mx8we/b44xu+Anb/EBLKjOPk9Yh541xJ5Ozc8EiP/5yxOp9c/lRiYUHaRW+4r0HKZyFt0eZ52ti2iM4Nfk7jRXR7an3JPsUIf5deC/1cVM/+1ZQIDAQAB",
+  "permissions": [
+    "debugger",
+    "activeTab",
+    "tabs",
+    "storage"
+  ],
+  "host_permissions": [
+    "<all_urls>"
+  ],
+  "background": {
+    "service_worker": "lib/background.mjs",
+    "type": "module"
+  },
+  "action": {
+    "default_title": "Playwright MCP Bridge",
+    "default_icon": {
+      "16": "icons/icon-16.png",
+      "32": "icons/icon-32.png",
+      "48": "icons/icon-48.png",
+      "128": "icons/icon-128.png"
+    }
+  },
+  "icons": {
+    "16": "icons/icon-16.png",
+    "32": "icons/icon-32.png",
+    "48": "icons/icon-48.png",
+    "128": "icons/icon-128.png"
+  }
+}

extension/package.json

@@ -0,0 +1,35 @@
+{
+  "name": "@playwright/mcp-extension",
+  "version": "0.0.36",
+  "description": "Playwright MCP Browser Extension",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/microsoft/playwright-mcp.git"
+  },
+  "homepage": "https://playwright.dev",
+  "engines": {
+    "node": ">=18"
+  },
+  "author": {
+    "name": "Microsoft Corporation"
+  },
+  "license": "Apache-2.0",
+  "scripts": {
+    "build": "tsc --project . && tsc --project tsconfig.ui.json && vite build && vite build --config vite.sw.config.mts",
+    "watch": "tsc --watch --project . & tsc --watch --project tsconfig.ui.json & vite build --watch & vite build --watch --config vite.sw.config.mts",
+    "test": "playwright test",
+    "clean": "rm -rf dist"
+  },
+  "devDependencies": {
+    "@types/chrome": "^0.0.315",
+    "@types/react": "^18.2.66",
+    "@types/react-dom": "^18.2.22",
+    "@vitejs/plugin-react": "^4.0.0",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
+    "typescript": "^5.8.2",
+    "vite": "^5.0.0",
+    "vite-plugin-static-copy": "^3.1.1"
+  }
+}

extension/playwright.config.ts

@@ -0,0 +1,31 @@
+/**
+ * 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 { defineConfig } from '@playwright/test';
+
+import type { TestOptions } from '../tests/fixtures';
+
+export default defineConfig<TestOptions>({
+  testDir: './tests',
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 0,
+  workers: process.env.CI ? 1 : undefined,
+  reporter: 'list',
+  projects: [
+    { name: 'chromium', use: { mcpBrowser: 'chromium' } },
+  ],
+});

extension/src/background.ts

@@ -0,0 +1,222 @@
+/**
+ * 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 { RelayConnection, debugLog } from './relayConnection';
+
+type PageMessage = {
+  type: 'connectToMCPRelay';
+  mcpRelayUrl: string;
+} | {
+  type: 'getTabs';
+} | {
+  type: 'connectToTab';
+  tabId?: number;
+  windowId?: number;
+  mcpRelayUrl: string;
+} | {
+  type: 'getConnectionStatus';
+} | {
+  type: 'disconnect';
+};
+
+class TabShareExtension {
+  private _activeConnection: RelayConnection | undefined;
+  private _connectedTabId: number | null = null;
+  private _pendingTabSelection = new Map<number, { connection: RelayConnection, timerId?: number }>();
+
+  constructor() {
+    chrome.tabs.onRemoved.addListener(this._onTabRemoved.bind(this));
+    chrome.tabs.onUpdated.addListener(this._onTabUpdated.bind(this));
+    chrome.tabs.onActivated.addListener(this._onTabActivated.bind(this));
+    chrome.runtime.onMessage.addListener(this._onMessage.bind(this));
+    chrome.action.onClicked.addListener(this._onActionClicked.bind(this));
+  }
+
+  // Promise-based message handling is not supported in Chrome: https://issues.chromium.org/issues/40753031
+  private _onMessage(message: PageMessage, sender: chrome.runtime.MessageSender, sendResponse: (response: any) => void) {
+    switch (message.type) {
+      case 'connectToMCPRelay':
+        this._connectToRelay(sender.tab!.id!, message.mcpRelayUrl).then(
+            () => sendResponse({ success: true }),
+            (error: any) => sendResponse({ success: false, error: error.message }));
+        return true;
+      case 'getTabs':
+        this._getTabs().then(
+            tabs => sendResponse({ success: true, tabs, currentTabId: sender.tab?.id }),
+            (error: any) => sendResponse({ success: false, error: error.message }));
+        return true;
+      case 'connectToTab':
+        const tabId = message.tabId || sender.tab?.id!;
+        const windowId = message.windowId || sender.tab?.windowId!;
+        this._connectTab(sender.tab!.id!, tabId, windowId, message.mcpRelayUrl!).then(
+            () => sendResponse({ success: true }),
+            (error: any) => sendResponse({ success: false, error: error.message }));
+        return true; // Return true to indicate that the response will be sent asynchronously
+      case 'getConnectionStatus':
+        sendResponse({
+          connectedTabId: this._connectedTabId
+        });
+        return false;
+      case 'disconnect':
+        this._disconnect().then(
+            () => sendResponse({ success: true }),
+            (error: any) => sendResponse({ success: false, error: error.message }));
+        return true;
+    }
+    return false;
+  }
+
+  private async _connectToRelay(selectorTabId: number, mcpRelayUrl: string): Promise<void> {
+    try {
+      debugLog(`Connecting to relay at ${mcpRelayUrl}`);
+      const socket = new WebSocket(mcpRelayUrl);
+      await new Promise<void>((resolve, reject) => {
+        socket.onopen = () => resolve();
+        socket.onerror = () => reject(new Error('WebSocket error'));
+        setTimeout(() => reject(new Error('Connection timeout')), 5000);
+      });
+
+      const connection = new RelayConnection(socket);
+      connection.onclose = () => {
+        debugLog('Connection closed');
+        this._pendingTabSelection.delete(selectorTabId);
+        // TODO: show error in the selector tab?
+      };
+      this._pendingTabSelection.set(selectorTabId, { connection });
+      debugLog(`Connected to MCP relay`);
+    } catch (error: any) {
+      const message = `Failed to connect to MCP relay: ${error.message}`;
+      debugLog(message);
+      throw new Error(message);
+    }
+  }
+
+  private async _connectTab(selectorTabId: number, tabId: number, windowId: number, mcpRelayUrl: string): Promise<void> {
+    try {
+      debugLog(`Connecting tab ${tabId} to relay at ${mcpRelayUrl}`);
+      try {
+        this._activeConnection?.close('Another connection is requested');
+      } catch (error: any) {
+        debugLog(`Error closing active connection:`, error);
+      }
+      await this._setConnectedTabId(null);
+
+      this._activeConnection = this._pendingTabSelection.get(selectorTabId)?.connection;
+      if (!this._activeConnection)
+        throw new Error('No active MCP relay connection');
+      this._pendingTabSelection.delete(selectorTabId);
+
+      this._activeConnection.setTabId(tabId);
+      this._activeConnection.onclose = () => {
+        debugLog('MCP connection closed');
+        this._activeConnection = undefined;
+        void this._setConnectedTabId(null);
+      };
+
+      await Promise.all([
+        this._setConnectedTabId(tabId),
+        chrome.tabs.update(tabId, { active: true }),
+        chrome.windows.update(windowId, { focused: true }),
+      ]);
+      debugLog(`Connected to MCP bridge`);
+    } catch (error: any) {
+      await this._setConnectedTabId(null);
+      debugLog(`Failed to connect tab ${tabId}:`, error.message);
+      throw error;
+    }
+  }
+
+  private async _setConnectedTabId(tabId: number | null): Promise<void> {
+    const oldTabId = this._connectedTabId;
+    this._connectedTabId = tabId;
+    if (oldTabId && oldTabId !== tabId)
+      await this._updateBadge(oldTabId, { text: '' });
+    if (tabId)
+      await this._updateBadge(tabId, { text: '✓', color: '#4CAF50', title: 'Connected to MCP client' });
+  }
+
+  private async _updateBadge(tabId: number, { text, color, title }: { text: string; color?: string, title?: string }): Promise<void> {
+    try {
+      await chrome.action.setBadgeText({ tabId, text });
+      await chrome.action.setTitle({ tabId, title: title || '' });
+      if (color)
+        await chrome.action.setBadgeBackgroundColor({ tabId, color });
+    } catch (error: any) {
+      // Ignore errors as the tab may be closed already.
+    }
+  }
+
+  private async _onTabRemoved(tabId: number): Promise<void> {
+    const pendingConnection = this._pendingTabSelection.get(tabId)?.connection;
+    if (pendingConnection) {
+      this._pendingTabSelection.delete(tabId);
+      pendingConnection.close('Browser tab closed');
+      return;
+    }
+    if (this._connectedTabId !== tabId)
+      return;
+    this._activeConnection?.close('Browser tab closed');
+    this._activeConnection = undefined;
+    this._connectedTabId = null;
+  }
+
+  private _onTabActivated(activeInfo: chrome.tabs.TabActiveInfo) {
+    for (const [tabId, pending] of this._pendingTabSelection) {
+      if (tabId === activeInfo.tabId) {
+        if (pending.timerId) {
+          clearTimeout(pending.timerId);
+          pending.timerId = undefined;
+        }
+        continue;
+      }
+      if (!pending.timerId) {
+        pending.timerId = setTimeout(() => {
+          const existed = this._pendingTabSelection.delete(tabId);
+          if (existed) {
+            pending.connection.close('Tab has been inactive for 5 seconds');
+            chrome.tabs.sendMessage(tabId, { type: 'connectionTimeout' });
+          }
+        }, 5000);
+        return;
+      }
+    }
+  }
+
+  private _onTabUpdated(tabId: number, changeInfo: chrome.tabs.TabChangeInfo, tab: chrome.tabs.Tab) {
+    if (this._connectedTabId === tabId)
+      void this._setConnectedTabId(tabId);
+  }
+
+  private async _getTabs(): Promise<chrome.tabs.Tab[]> {
+    const tabs = await chrome.tabs.query({});
+    return tabs.filter(tab => tab.url && !['chrome:', 'edge:', 'devtools:'].some(scheme => tab.url!.startsWith(scheme)));
+  }
+
+  private async _onActionClicked(): Promise<void> {
+    await chrome.tabs.create({
+      url: chrome.runtime.getURL('status.html'),
+      active: true
+    });
+  }
+
+  private async _disconnect(): Promise<void> {
+    this._activeConnection?.close('User disconnected');
+    this._activeConnection = undefined;
+    await this._setConnectedTabId(null);
+  }
+}
+
+new TabShareExtension();

extension/src/relayConnection.ts

@@ -0,0 +1,178 @@
+/**
+ * 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.
+ */
+
+export function debugLog(...args: unknown[]): void {
+  const enabled = true;
+  if (enabled) {
+    // eslint-disable-next-line no-console
+    console.log('[Extension]', ...args);
+  }
+}
+
+type ProtocolCommand = {
+  id: number;
+  method: string;
+  params?: any;
+};
+
+type ProtocolResponse = {
+  id?: number;
+  method?: string;
+  params?: any;
+  result?: any;
+  error?: string;
+};
+
+export class RelayConnection {
+  private _debuggee: chrome.debugger.Debuggee;
+  private _ws: WebSocket;
+  private _eventListener: (source: chrome.debugger.DebuggerSession, method: string, params: any) => void;
+  private _detachListener: (source: chrome.debugger.Debuggee, reason: string) => void;
+  private _tabPromise: Promise<void>;
+  private _tabPromiseResolve!: () => void;
+  private _closed = false;
+
+  onclose?: () => void;
+
+  constructor(ws: WebSocket) {
+    this._debuggee = { };
+    this._tabPromise = new Promise(resolve => this._tabPromiseResolve = resolve);
+    this._ws = ws;
+    this._ws.onmessage = this._onMessage.bind(this);
+    this._ws.onclose = () => this._onClose();
+    // Store listeners for cleanup
+    this._eventListener = this._onDebuggerEvent.bind(this);
+    this._detachListener = this._onDebuggerDetach.bind(this);
+    chrome.debugger.onEvent.addListener(this._eventListener);
+    chrome.debugger.onDetach.addListener(this._detachListener);
+  }
+
+  // Either setTabId or close is called after creating the connection.
+  setTabId(tabId: number): void {
+    this._debuggee = { tabId };
+    this._tabPromiseResolve();
+  }
+
+  close(message: string): void {
+    this._ws.close(1000, message);
+    // ws.onclose is called asynchronously, so we call it here to avoid forwarding
+    // CDP events to the closed connection.
+    this._onClose();
+  }
+
+  private _onClose() {
+    if (this._closed)
+      return;
+    this._closed = true;
+    chrome.debugger.onEvent.removeListener(this._eventListener);
+    chrome.debugger.onDetach.removeListener(this._detachListener);
+    chrome.debugger.detach(this._debuggee).catch(() => {});
+    this.onclose?.();
+  }
+
+  private _onDebuggerEvent(source: chrome.debugger.DebuggerSession, method: string, params: any): void {
+    if (source.tabId !== this._debuggee.tabId)
+      return;
+    debugLog('Forwarding CDP event:', method, params);
+    const sessionId = source.sessionId;
+    this._sendMessage({
+      method: 'forwardCDPEvent',
+      params: {
+        sessionId,
+        method,
+        params,
+      },
+    });
+  }
+
+  private _onDebuggerDetach(source: chrome.debugger.Debuggee, reason: string): void {
+    if (source.tabId !== this._debuggee.tabId)
+      return;
+    this.close(`Debugger detached: ${reason}`);
+    this._debuggee = { };
+  }
+
+  private _onMessage(event: MessageEvent): void {
+    this._onMessageAsync(event).catch(e => debugLog('Error handling message:', e));
+  }
+
+  private async _onMessageAsync(event: MessageEvent): Promise<void> {
+    let message: ProtocolCommand;
+    try {
+      message = JSON.parse(event.data);
+    } catch (error: any) {
+      debugLog('Error parsing message:', error);
+      this._sendError(-32700, `Error parsing message: ${error.message}`);
+      return;
+    }
+
+    debugLog('Received message:', message);
+
+    const response: ProtocolResponse = {
+      id: message.id,
+    };
+    try {
+      response.result = await this._handleCommand(message);
+    } catch (error: any) {
+      debugLog('Error handling command:', error);
+      response.error = error.message;
+    }
+    debugLog('Sending response:', response);
+    this._sendMessage(response);
+  }
+
+  private async _handleCommand(message: ProtocolCommand): Promise<any> {
+    if (message.method === 'attachToTab') {
+      await this._tabPromise;
+      debugLog('Attaching debugger to tab:', this._debuggee);
+      await chrome.debugger.attach(this._debuggee, '1.3');
+      const result: any = await chrome.debugger.sendCommand(this._debuggee, 'Target.getTargetInfo');
+      return {
+        targetInfo: result?.targetInfo,
+      };
+    }
+    if (!this._debuggee.tabId)
+      throw new Error('No tab is connected. Please go to the Playwright MCP extension and select the tab you want to connect to.');
+    if (message.method === 'forwardCDPCommand') {
+      const { sessionId, method, params } = message.params;
+      debugLog('CDP command:', method, params);
+      const debuggerSession: chrome.debugger.DebuggerSession = {
+        ...this._debuggee,
+        sessionId,
+      };
+      // Forward CDP command to chrome.debugger
+      return await chrome.debugger.sendCommand(
+          debuggerSession,
+          method,
+          params
+      );
+    }
+  }
+
+  private _sendError(code: number, message: string): void {
+    this._sendMessage({
+      error: {
+        code,
+        message,
+      },
+    });
+  }
+
+  private _sendMessage(message: any): void {
+    if (this._ws.readyState === WebSocket.OPEN)
+      this._ws.send(JSON.stringify(message));
+  }
+}

extension/src/ui/connect.css

@@ -0,0 +1,206 @@
+/*
+  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.
+*/
+
+body {
+  margin: 0;
+  padding: 0;
+}
+
+/* Base styles */
+.app-container {
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
+  background-color: #ffffff;
+  color: #1f2328;
+  margin: 0;
+  padding: 16px;
+  min-height: 100vh;
+  font-size: 14px;
+}
+
+.content-wrapper {
+  max-width: 600px;
+  margin: 0 auto;
+}
+
+/* Status Banner */
+.status-container {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 16px;
+  padding-right: 12px;
+}
+
+.status-banner {
+  padding: 12px;
+  font-size: 14px;
+  font-weight: 500;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex: 1;
+}
+
+.status-banner.connected {
+  color: #1f2328;
+}
+
+.status-banner.connected::before {
+  content: "\2705";
+  margin-right: 8px;
+}
+
+.status-banner.error {
+  color: #1f2328;
+}
+
+.status-banner.error::before {
+  content: "\274C";
+  margin-right: 8px;
+}
+
+/* Buttons */
+.button-container {
+  margin-bottom: 16px;
+  display: flex;
+  justify-content: flex-end;
+  padding-right: 12px;
+}
+
+.button {
+  padding: 8px 16px;
+  border-radius: 6px;
+  border: none;
+  font-size: 14px;
+  font-weight: 500;
+  cursor: pointer;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  text-decoration: none;
+  margin-right: 8px;
+  min-width: 90px;
+}
+
+.button.primary {
+  background-color: #f8f9fa;
+  color: #3c4043;
+  border: 1px solid #dadce0;
+}
+
+.button.primary:hover {
+  background-color: #f1f3f4;
+  border-color: #dadce0;
+  box-shadow: 0 1px 2px 0 rgba(60,64,67,.1);
+}
+
+.button.default {
+  background-color: #f6f8fa;
+  color: #24292f;
+}
+
+.button.default:hover {
+  background-color: #f3f4f6;
+}
+
+.button.reject {
+  background-color: #da3633;
+  color: #ffffff;
+  border: 1px solid #da3633;
+}
+
+.button.reject:hover {
+  background-color: #c73836;
+  border-color: #c73836;
+}
+
+/* Tab selection */
+.tab-section-title {
+  padding-left: 12px;
+  font-size: 12px;
+  font-weight: 400;
+  margin-bottom: 12px;
+  color: #656d76;
+}
+
+.tab-item {
+  display: flex;
+  align-items: center;
+  padding: 12px;
+  margin-bottom: 8px;
+  background-color: #ffffff;
+  cursor: pointer;
+  border-radius: 6px;
+  transition: background-color 0.2s ease;
+}
+
+.tab-item:hover {
+  background-color: #f8f9fa;
+}
+
+.tab-item.selected {
+  background-color: #f6f8fa;
+}
+
+.tab-item.disabled {
+  cursor: not-allowed;
+  opacity: 0.5;
+}
+
+.tab-radio {
+  margin-right: 12px;
+  flex-shrink: 0;
+}
+
+.tab-favicon {
+  width: 16px;
+  height: 16px;
+  margin-right: 8px;
+  flex-shrink: 0;
+}
+
+.tab-content {
+  flex: 1;
+  min-width: 0;
+}
+
+.tab-title {
+  font-weight: 500;
+  color: #1f2328;
+  margin-bottom: 2px;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.tab-url {
+  font-size: 12px;
+  color: #656d76;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+/* Link-style button */
+.link-button {
+  background: none;
+  border: none;
+  color: #0066cc;
+  text-decoration: underline;
+  cursor: pointer;
+  padding: 0;
+  font: inherit;
+}

extension/src/ui/connect.html

@@ -0,0 +1,29 @@
+<!--
+  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.
+-->
+<!DOCTYPE html>
+<html>
+<head>
+  <title>Playwright MCP extension</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="icon" type="image/png" sizes="32x32" href="../../icons/icon-32.png">
+  <link rel="icon" type="image/png" sizes="16x16" href="../../icons/icon-16.png">
+  <link rel="stylesheet" href="connect.css">
+</head>
+<body>
+  <div id="root"></div>
+  <script type="module" src="connect.tsx"></script>
+</body>
+</html> 

extension/src/ui/connect.tsx

@@ -0,0 +1,233 @@
+/**
+ * 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 React, { useState, useEffect, useCallback } from 'react';
+import { createRoot } from 'react-dom/client';
+import { Button, TabItem  } from './tabItem';
+import type { TabInfo } from './tabItem';
+
+type Status =
+  | { type: 'connecting'; message: string }
+  | { type: 'connected'; message: string }
+  | { type: 'error'; message: string }
+  | { type: 'error'; versionMismatch: { extensionVersion: string; } };
+
+const SUPPORTED_PROTOCOL_VERSION = 1;
+
+const ConnectApp: React.FC = () => {
+  const [tabs, setTabs] = useState<TabInfo[]>([]);
+  const [status, setStatus] = useState<Status | null>(null);
+  const [showButtons, setShowButtons] = useState(true);
+  const [showTabList, setShowTabList] = useState(true);
+  const [clientInfo, setClientInfo] = useState('unknown');
+  const [mcpRelayUrl, setMcpRelayUrl] = useState('');
+  const [newTab, setNewTab] = useState<boolean>(false);
+
+  useEffect(() => {
+    const params = new URLSearchParams(window.location.search);
+    const relayUrl = params.get('mcpRelayUrl');
+
+    if (!relayUrl) {
+      setShowButtons(false);
+      setStatus({ type: 'error', message: 'Missing mcpRelayUrl parameter in URL.' });
+      return;
+    }
+
+    setMcpRelayUrl(relayUrl);
+
+    try {
+      const client = JSON.parse(params.get('client') || '{}');
+      const info = `${client.name}/${client.version}`;
+      setClientInfo(info);
+      setStatus({
+        type: 'connecting',
+        message: `🎭 Playwright MCP started from  "${info}" is trying to connect. Do you want to continue?`
+      });
+    } catch (e) {
+      setStatus({ type: 'error', message: 'Failed to parse client version.' });
+      return;
+    }
+
+    const parsedVersion = parseInt(params.get('protocolVersion') ?? '', 10);
+    const requiredVersion = isNaN(parsedVersion) ? 1 : parsedVersion;
+    if (requiredVersion > SUPPORTED_PROTOCOL_VERSION) {
+      const extensionVersion = chrome.runtime.getManifest().version;
+      setShowButtons(false);
+      setShowTabList(false);
+      setStatus({
+        type: 'error',
+        versionMismatch: {
+          extensionVersion,
+        }
+      });
+      return;
+    }
+
+    void connectToMCPRelay(relayUrl);
+
+    // If this is a browser_navigate command, hide the tab list and show simple allow/reject
+    if (params.get('newTab') === 'true') {
+      setNewTab(true);
+      setShowTabList(false);
+    } else {
+      void loadTabs();
+    }
+  }, []);
+
+  const handleReject = useCallback((message: string) => {
+    setShowButtons(false);
+    setShowTabList(false);
+    setStatus({ type: 'error', message });
+  }, []);
+
+  const connectToMCPRelay = useCallback(async (mcpRelayUrl: string) => {
+
+    const response = await chrome.runtime.sendMessage({ type: 'connectToMCPRelay', mcpRelayUrl  });
+    if (!response.success)
+      handleReject(response.error);
+  }, [handleReject]);
+
+  const loadTabs = useCallback(async () => {
+    const response = await chrome.runtime.sendMessage({ type: 'getTabs' });
+    if (response.success)
+      setTabs(response.tabs);
+    else
+      setStatus({ type: 'error', message: 'Failed to load tabs: ' + response.error });
+  }, []);
+
+  const handleConnectToTab = useCallback(async (tab?: TabInfo) => {
+    setShowButtons(false);
+    setShowTabList(false);
+
+    try {
+      const response = await chrome.runtime.sendMessage({
+        type: 'connectToTab',
+        mcpRelayUrl,
+        tabId: tab?.id,
+        windowId: tab?.windowId,
+      });
+
+      if (response?.success) {
+        setStatus({ type: 'connected', message: `MCP client "${clientInfo}" connected.` });
+      } else {
+        setStatus({
+          type: 'error',
+          message: response?.error || `MCP client "${clientInfo}" failed to connect.`
+        });
+      }
+    } catch (e) {
+      setStatus({
+        type: 'error',
+        message: `MCP client "${clientInfo}" failed to connect: ${e}`
+      });
+    }
+  }, [clientInfo, mcpRelayUrl]);
+
+  useEffect(() => {
+    const listener = (message: any) => {
+      if (message.type === 'connectionTimeout')
+        handleReject('Connection timed out.');
+    };
+    chrome.runtime.onMessage.addListener(listener);
+    return () => {
+      chrome.runtime.onMessage.removeListener(listener);
+    };
+  }, [handleReject]);
+
+  return (
+    <div className='app-container'>
+      <div className='content-wrapper'>
+        {status && (
+          <div className='status-container'>
+            <StatusBanner status={status} />
+            {showButtons && (
+              <div className='button-container'>
+                {newTab ? (
+                  <>
+                    <Button variant='primary' onClick={() => handleConnectToTab()}>
+                      Allow
+                    </Button>
+                    <Button variant='reject' onClick={() => handleReject('Connection rejected. This tab can be closed.')}>
+                      Reject
+                    </Button>
+                  </>
+                ) : (
+                  <Button variant='reject' onClick={() => handleReject('Connection rejected. This tab can be closed.')}>
+                    Reject
+                  </Button>
+                )}
+              </div>
+            )}
+          </div>
+        )}
+
+        {showTabList && (
+          <div>
+            <div className='tab-section-title'>
+              Select page to expose to MCP server:
+            </div>
+            <div>
+              {tabs.map(tab => (
+                <TabItem
+                  key={tab.id}
+                  tab={tab}
+                  button={
+                    <Button variant='primary' onClick={() => handleConnectToTab(tab)}>
+                      Connect
+                    </Button>
+                  }
+                />
+              ))}
+            </div>
+          </div>
+        )}
+      </div>
+    </div>
+  );
+};
+
+const VersionMismatchError: React.FC<{ extensionVersion: string }> = ({ extensionVersion }) => {
+  const readmeUrl = 'https://github.com/microsoft/playwright-mcp/blob/main/extension/README.md';
+  const latestReleaseUrl = 'https://github.com/microsoft/playwright-mcp/releases/latest';
+  return (
+    <div>
+      Playwright MCP version trying to connect requires newer extension version (current version: {extensionVersion}).{' '}
+      <a href={latestReleaseUrl}>Click here</a> to download latest version of the extension, then drag and drop it into the Chrome Extensions page.{' '}
+      See <a href={readmeUrl} target='_blank' rel='noopener noreferrer'>installation instructions</a> for more details.
+    </div>
+  );
+};
+
+const StatusBanner: React.FC<{ status: Status }> = ({ status }) => {
+  return (
+    <div className={`status-banner ${status.type}`}>
+      {'versionMismatch' in status ? (
+        <VersionMismatchError
+          extensionVersion={status.versionMismatch.extensionVersion}
+        />
+      ) : (
+        status.message
+      )}
+    </div>
+  );
+};
+
+// Initialize the React app
+const container = document.getElementById('root');
+if (container) {
+  const root = createRoot(container);
+  root.render(<ConnectApp />);
+}

extension/src/ui/status.html

@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Playwright MCP Bridge Status</title>
+  <link rel="stylesheet" href="connect.css">
+</head>
+<body>
+  <div id="root"></div>
+  <script src="status.tsx" type="module"></script>
+</body>
+</html>

extension/src/ui/status.tsx

@@ -0,0 +1,110 @@
+/**
+ * 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 React, { useState, useEffect } from 'react';
+import { createRoot } from 'react-dom/client';
+import { Button, TabItem  } from './tabItem';
+
+import type { TabInfo } from './tabItem';
+
+interface ConnectionStatus {
+  isConnected: boolean;
+  connectedTabId: number | null;
+  connectedTab?: TabInfo;
+}
+
+const StatusApp: React.FC = () => {
+  const [status, setStatus] = useState<ConnectionStatus>({
+    isConnected: false,
+    connectedTabId: null
+  });
+
+  useEffect(() => {
+    void loadStatus();
+  }, []);
+
+  const loadStatus = async () => {
+    // Get current connection status from background script
+    const { connectedTabId } = await chrome.runtime.sendMessage({ type: 'getConnectionStatus' });
+    if (connectedTabId) {
+      const tab = await chrome.tabs.get(connectedTabId);
+      setStatus({
+        isConnected: true,
+        connectedTabId,
+        connectedTab: {
+          id: tab.id!,
+          windowId: tab.windowId!,
+          title: tab.title!,
+          url: tab.url!,
+          favIconUrl: tab.favIconUrl
+        }
+      });
+    } else {
+      setStatus({
+        isConnected: false,
+        connectedTabId: null
+      });
+    }
+  };
+
+  const openConnectedTab = async () => {
+    if (!status.connectedTabId)
+      return;
+    await chrome.tabs.update(status.connectedTabId, { active: true });
+    window.close();
+  };
+
+  const disconnect = async () => {
+    await chrome.runtime.sendMessage({ type: 'disconnect' });
+    window.close();
+  };
+
+  return (
+    <div className='app-container'>
+      <div className='content-wrapper'>
+        {status.isConnected && status.connectedTab ? (
+          <div>
+            <div className='tab-section-title'>
+              Page with connected MCP client:
+            </div>
+            <div>
+              <TabItem
+                tab={status.connectedTab}
+                button={
+                  <Button variant='primary' onClick={disconnect}>
+                    Disconnect
+                  </Button>
+                }
+                onClick={openConnectedTab}
+              />
+            </div>
+          </div>
+        ) : (
+          <div className='status-banner'>
+            No MCP clients are currently connected.
+          </div>
+        )}
+      </div>
+    </div>
+  );
+};
+
+// Initialize the React app
+const container = document.getElementById('root');
+if (container) {
+  const root = createRoot(container);
+  root.render(<StatusApp />);
+}

extension/src/ui/tabItem.tsx

@@ -0,0 +1,67 @@
+/**
+ * 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 React from 'react';
+
+export interface TabInfo {
+  id: number;
+  windowId: number;
+  title: string;
+  url: string;
+  favIconUrl?: string;
+}
+
+export const Button: React.FC<{ variant: 'primary' | 'default' | 'reject'; onClick: () => void; children: React.ReactNode }> = ({
+  variant,
+  onClick,
+  children
+}) => {
+  return (
+    <button className={`button ${variant}`} onClick={onClick}>
+      {children}
+    </button>
+  );
+};
+
+
+export interface TabItemProps {
+  tab: TabInfo;
+  onClick?: () => void;
+  button?: React.ReactNode;
+}
+
+export const TabItem: React.FC<TabItemProps> = ({
+  tab,
+  onClick,
+  button
+}) => {
+  return (
+    <div className='tab-item' onClick={onClick} style={onClick ? { cursor: 'pointer' } : undefined}>
+      <img
+        src={tab.favIconUrl || 'data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><rect width="16" height="16" fill="%23f6f8fa"/></svg>'}
+        alt=''
+        className='tab-favicon'
+      />
+      <div className='tab-content'>
+        <div className='tab-title'>
+          {tab.title || 'Untitled'}
+        </div>
+        <div className='tab-url'>{tab.url}</div>
+      </div>
+      {button}
+    </div>
+  );
+};

extension/src/ui/tsconfig.json

@@ -0,0 +1,4 @@
+// Help VSCode to find right tsconfig file.
+{
+    "extends": "../../tsconfig.ui.json"
+}

extension/tests/extension.spec.ts

@@ -0,0 +1,306 @@
+/**
+ * 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 fs from 'fs';
+import path from 'path';
+import { chromium } from 'playwright';
+import { test as base, expect } from '../../tests/fixtures';
+
+import type { Client } from '@modelcontextprotocol/sdk/client/index.js';
+import type { BrowserContext } from 'playwright';
+import type { StartClient } from '../../tests/fixtures';
+
+type BrowserWithExtension = {
+  userDataDir: string;
+  launch: (mode?: 'disable-extension') => Promise<BrowserContext>;
+};
+
+type TestFixtures = {
+  browserWithExtension: BrowserWithExtension,
+  pathToExtension: string,
+  useShortConnectionTimeout: (timeoutMs: number) => void
+  overrideProtocolVersion: (version: number) => void
+};
+
+const test = base.extend<TestFixtures>({
+  pathToExtension: async ({}, use) => {
+    await use(path.resolve(__dirname, '../dist'));
+  },
+
+  browserWithExtension: async ({ mcpBrowser, pathToExtension }, use, testInfo) => {
+    // The flags no longer work in Chrome since
+    // https://chromium.googlesource.com/chromium/src/+/290ed8046692651ce76088914750cb659b65fb17%5E%21/chrome/browser/extensions/extension_service.cc?pli=1#
+    test.skip('chromium' !== mcpBrowser, '--load-extension is not supported for official builds of Chromium');
+
+    let browserContext: BrowserContext | undefined;
+    const userDataDir = testInfo.outputPath('extension-user-data-dir');
+    await use({
+      userDataDir,
+      launch: async (mode?: 'disable-extension') => {
+        browserContext = await chromium.launchPersistentContext(userDataDir, {
+          channel: mcpBrowser,
+          // Opening the browser singleton only works in headed.
+          headless: false,
+          // Automation disables singleton browser process behavior, which is necessary for the extension.
+          ignoreDefaultArgs: ['--enable-automation'],
+          args: mode === 'disable-extension' ? [] : [
+            `--disable-extensions-except=${pathToExtension}`,
+            `--load-extension=${pathToExtension}`,
+          ],
+        });
+
+        // for manifest v3:
+        let [serviceWorker] = browserContext.serviceWorkers();
+        if (!serviceWorker)
+          serviceWorker = await browserContext.waitForEvent('serviceworker');
+
+        return browserContext;
+      }
+    });
+    await browserContext?.close();
+  },
+
+  useShortConnectionTimeout: async ({}, use) => {
+    await use((timeoutMs: number) => {
+      process.env.PWMCP_TEST_CONNECTION_TIMEOUT = timeoutMs.toString();
+    });
+    process.env.PWMCP_TEST_CONNECTION_TIMEOUT = undefined;
+  },
+
+  overrideProtocolVersion: async ({}, use) => {
+    await use((version: number) => {
+      process.env.PWMCP_TEST_PROTOCOL_VERSION = version.toString();
+    });
+    process.env.PWMCP_TEST_PROTOCOL_VERSION = undefined;
+  }
+});
+
+async function startAndCallConnectTool(browserWithExtension: BrowserWithExtension, startClient: StartClient): Promise<Client> {
+  const { client } = await startClient({
+    args: [`--connect-tool`],
+    config: {
+      browser: {
+        userDataDir: browserWithExtension.userDataDir,
+      }
+    },
+  });
+
+  expect(await client.callTool({
+    name: 'browser_connect',
+    arguments: {
+      name: 'extension'
+    }
+  })).toHaveResponse({
+    result: 'Successfully changed connection method.',
+  });
+
+  return client;
+}
+
+async function startWithExtensionFlag(browserWithExtension: BrowserWithExtension, startClient: StartClient): Promise<Client> {
+  const { client } = await startClient({
+    args: [`--extension`],
+    config: {
+      browser: {
+        userDataDir: browserWithExtension.userDataDir,
+      }
+    },
+  });
+  return client;
+}
+
+const testWithOldExtensionVersion = test.extend({
+  pathToExtension: async ({}, use, testInfo) => {
+    const extensionDir = testInfo.outputPath('extension');
+    const oldPath = path.resolve(__dirname, '../dist');
+
+    await fs.promises.cp(oldPath, extensionDir, { recursive: true });
+    const manifestPath = path.join(extensionDir, 'manifest.json');
+    const manifest = JSON.parse(await fs.promises.readFile(manifestPath, 'utf8'));
+    manifest.version = '0.0.1';
+    await fs.promises.writeFile(manifestPath, JSON.stringify(manifest, null, 2) + '\n');
+
+    await use(extensionDir);
+  },
+});
+
+for (const [mode, startClientMethod] of [
+  ['connect-tool', startAndCallConnectTool],
+  ['extension-flag', startWithExtensionFlag],
+] as const) {
+
+  test(`navigate with extension (${mode})`, async ({ browserWithExtension, startClient, server }) => {
+    const browserContext = await browserWithExtension.launch();
+
+    const client = await startClientMethod(browserWithExtension, startClient);
+
+    const confirmationPagePromise = browserContext.waitForEvent('page', page => {
+      return page.url().startsWith('chrome-extension://jakfalbnbhgkpmoaakfflhflbfpkailf/connect.html');
+    });
+
+    const navigateResponse = client.callTool({
+      name: 'browser_navigate',
+      arguments: { url: server.HELLO_WORLD },
+    });
+
+    const selectorPage = await confirmationPagePromise;
+    // For browser_navigate command, the UI shows Allow/Reject buttons instead of tab selector
+    await selectorPage.getByRole('button', { name: 'Allow' }).click();
+
+    expect(await navigateResponse).toHaveResponse({
+      pageState: expect.stringContaining(`- generic [active] [ref=e1]: Hello, world!`),
+    });
+  });
+
+  test(`snapshot of an existing page (${mode})`, async ({ browserWithExtension, startClient, server }) => {
+    const browserContext = await browserWithExtension.launch();
+
+    const page = await browserContext.newPage();
+    await page.goto(server.HELLO_WORLD);
+
+    // Another empty page.
+    await browserContext.newPage();
+    expect(browserContext.pages()).toHaveLength(3);
+
+    const client = await startClientMethod(browserWithExtension, startClient);
+    expect(browserContext.pages()).toHaveLength(3);
+
+    const confirmationPagePromise = browserContext.waitForEvent('page', page => {
+      return page.url().startsWith('chrome-extension://jakfalbnbhgkpmoaakfflhflbfpkailf/connect.html');
+    });
+
+    const navigateResponse = client.callTool({
+      name: 'browser_snapshot',
+      arguments: { },
+    });
+
+    const selectorPage = await confirmationPagePromise;
+    expect(browserContext.pages()).toHaveLength(4);
+
+    await selectorPage.locator('.tab-item', { hasText: 'Title' }).getByRole('button', { name: 'Connect' }).click();
+
+    expect(await navigateResponse).toHaveResponse({
+      pageState: expect.stringContaining(`- generic [active] [ref=e1]: Hello, world!`),
+    });
+
+    expect(browserContext.pages()).toHaveLength(4);
+  });
+
+  test(`extension not installed timeout (${mode})`, async ({ browserWithExtension, startClient, server, useShortConnectionTimeout }) => {
+    useShortConnectionTimeout(100);
+
+    const browserContext = await browserWithExtension.launch();
+
+    const client = await startClientMethod(browserWithExtension, startClient);
+
+    const confirmationPagePromise = browserContext.waitForEvent('page', page => {
+      return page.url().startsWith('chrome-extension://jakfalbnbhgkpmoaakfflhflbfpkailf/connect.html');
+    });
+
+    expect(await client.callTool({
+      name: 'browser_navigate',
+      arguments: { url: server.HELLO_WORLD },
+    })).toHaveResponse({
+      result: expect.stringContaining('Extension connection timeout. Make sure the "Playwright MCP Bridge" extension is installed.'),
+      isError: true,
+    });
+
+    await confirmationPagePromise;
+  });
+
+  testWithOldExtensionVersion(`works with old extension version (${mode})`, async ({ browserWithExtension, startClient, server, useShortConnectionTimeout }) => {
+    useShortConnectionTimeout(500);
+
+    // Prelaunch the browser, so that it is properly closed after the test.
+    const browserContext = await browserWithExtension.launch();
+
+    const client = await startClientMethod(browserWithExtension, startClient);
+
+    const confirmationPagePromise = browserContext.waitForEvent('page', page => {
+      return page.url().startsWith('chrome-extension://jakfalbnbhgkpmoaakfflhflbfpkailf/connect.html');
+    });
+
+    const navigateResponse = client.callTool({
+      name: 'browser_navigate',
+      arguments: { url: server.HELLO_WORLD },
+    });
+
+    const selectorPage = await confirmationPagePromise;
+    // For browser_navigate command, the UI shows Allow/Reject buttons instead of tab selector
+    await selectorPage.getByRole('button', { name: 'Allow' }).click();
+
+    expect(await navigateResponse).toHaveResponse({
+      pageState: expect.stringContaining(`- generic [active] [ref=e1]: Hello, world!`),
+    });
+  });
+
+  test(`extension needs update (${mode})`, async ({ browserWithExtension, startClient, server, useShortConnectionTimeout, overrideProtocolVersion }) => {
+    useShortConnectionTimeout(500);
+    overrideProtocolVersion(1000);
+
+    // Prelaunch the browser, so that it is properly closed after the test.
+    const browserContext = await browserWithExtension.launch();
+
+    const client = await startClientMethod(browserWithExtension, startClient);
+
+    const confirmationPagePromise = browserContext.waitForEvent('page', page => {
+      return page.url().startsWith('chrome-extension://jakfalbnbhgkpmoaakfflhflbfpkailf/connect.html');
+    });
+
+    const navigateResponse = client.callTool({
+      name: 'browser_navigate',
+      arguments: { url: server.HELLO_WORLD },
+    });
+
+    const confirmationPage = await confirmationPagePromise;
+    await expect(confirmationPage.locator('.status-banner')).toContainText(`Playwright MCP version trying to connect requires newer extension version`);
+
+    expect(await navigateResponse).toHaveResponse({
+      result: expect.stringContaining('Extension connection timeout.'),
+      isError: true,
+    });
+  });
+
+}
+
+test(`custom executablePath`, async ({ startClient, server, useShortConnectionTimeout }) => {
+  useShortConnectionTimeout(1000);
+
+  const executablePath = test.info().outputPath('echo.sh');
+  await fs.promises.writeFile(executablePath, '#!/bin/bash\necho "Custom exec args: $@" > "$(dirname "$0")/output.txt"', { mode: 0o755 });
+
+  const { client } = await startClient({
+    args: [`--extension`],
+    config: {
+      browser: {
+        launchOptions: {
+          executablePath,
+        },
+      }
+    },
+  });
+
+  const navigateResponse = await client.callTool({
+    name: 'browser_navigate',
+    arguments: { url: server.HELLO_WORLD },
+    timeout: 1000,
+  });
+  expect(await navigateResponse).toHaveResponse({
+    result: expect.stringContaining('Extension connection timeout.'),
+    isError: true,
+  });
+  expect(await fs.promises.readFile(test.info().outputPath('output.txt'), 'utf8')).toContain('Custom exec args: chrome-extension://jakfalbnbhgkpmoaakfflhflbfpkailf/connect.html?');
+});

extension/tsconfig.json

@@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "esModuleInterop": true,
+    "moduleResolution": "node",
+    "strict": true,
+    "module": "ESNext",
+    "rootDir": "src",
+    "outDir": "./dist/lib",
+    "resolveJsonModule": true,
+    "types": ["chrome"],
+    "jsx": "react-jsx",
+    "jsxImportSource": "react",
+    "noEmit": true
+  },
+  "include": [
+    "src",
+  ],
+  "exclude": [
+    "src/ui",
+  ]
+}

extension/tsconfig.ui.json

@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "esModuleInterop": true,
+    "moduleResolution": "node",
+    "strict": true,
+    "module": "ESNext",
+    "rootDir": "src",
+    "outDir": "./lib",
+    "resolveJsonModule": true,
+    "types": ["chrome"],
+    "jsx": "react-jsx",
+    "jsxImportSource": "react",
+    "noEmit": true,
+  },
+  "include": [
+    "src/ui",
+  ],
+}

extension/vite.config.mts

@@ -0,0 +1,54 @@
+/**
+ * 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 { resolve } from 'path';
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+import { viteStaticCopy } from 'vite-plugin-static-copy';
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [
+    react(),
+    viteStaticCopy({
+      targets: [
+        {
+          src: '../../icons/*',
+          dest: 'icons'
+        },
+        {
+          src: '../../manifest.json',
+          dest: '.'
+        }
+      ]
+    })
+  ],
+  root: resolve(__dirname, 'src/ui'),
+  build: {
+    outDir: resolve(__dirname, 'dist/'),
+    emptyOutDir: false,
+    minify: false,
+    rollupOptions: {
+      input: ['src/ui/connect.html', 'src/ui/status.html'],
+      output: {
+        manualChunks: undefined,
+        entryFileNames: 'lib/ui/[name].js',
+        chunkFileNames: 'lib/ui/[name].js',
+        assetFileNames: 'lib/ui/[name].[ext]'
+      }
+    }
+  }
+});

extension/vite.sw.config.mts

@@ -0,0 +1,31 @@
+/**
+ * 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 { resolve } from 'path';
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+  build: {
+    lib: {
+      entry: resolve(__dirname, 'src/background.ts'),
+      fileName: 'lib/background',
+      formats: ['es']
+    },
+    outDir: 'dist',
+    emptyOutDir: false,
+    minify: false
+  }
+});