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Playwright MCP Server

by Krutas
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Playwright MCP Server

Browser automation via the Model Context Protocol. Supports headless Playwright, Chrome Extension bridge, and Firefox Extension bridge for controlling existing browser tabs.

Quick Start

npm install
npx playwright install chromium
npm run build
node dist/index.js

Related MCP server: openmcp

Extension Bridges

Link the MCP agent to your existing browser tabs. Two extensions are provided:

Chrome Extension (extension/)

Uses chrome.debugger API (CDP) for full browser control.

  1. Go to chrome://extensions → Load unpacked → select extension/

  2. Start the MCP server: node dist/index.js

  3. Click the extension icon → Connect

  4. Use extension_* tools

Firefox Extension (extension-firefox/)

Uses WebExtensions API with content scripts (no CDP dependency).

  1. Go to about:debugging#/runtime/this-firefox → Load Temporary Add-on → select extension-firefox/manifest.json

  2. Start the MCP server: node dist/index.js

  3. Click the extension icon → Connect

  4. Use firefox_* tools

Extension Tools

Shared (Chrome + Firefox)

Tool

Description

extension_connect

Check extension connection status

extension_evaluate

Execute JavaScript in the tab

extension_screenshot

Capture a screenshot of the tab

extension_get_tabs

List all open browser tabs

extension_attach_tab

Attach to a specific tab by ID

Chrome CDP Tools

Tool

Description

extension_navigate

Navigate the connected tab to a URL

extension_click

Click an element by CSS selector

Firefox Content Script Tools

Tool

Description

firefox_navigate

Navigate the connected tab to a URL

firefox_click

Click an element by CSS selector

firefox_type

Type text into an input field

firefox_fill

Fill an input field with a value

firefox_get_text

Get text content of an element

firefox_get_html

Get HTML content of page or element

firefox_hover

Hover over an element

firefox_select

Select an option in a select element

firefox_check

Check a checkbox

firefox_uncheck

Uncheck a checkbox

firefox_get_attribute

Get an attribute value from an element

firefox_get_url

Get the current page URL

firefox_get_title

Get the current page title

firefox_go_back

Navigate back in history

firefox_go_forward

Navigate forward in history

firefox_reload

Reload the current page

firefox_scroll

Scroll the page

firefox_screenshot

Take a screenshot of the connected tab

firefox_evaluate

Execute JavaScript in the connected tab

Headless Mode (Default)

25+ browser_* tools for headless Chromium via Playwright.

Configuration

Env Var

Default

Description

MCP_WS_PORT

9223

WebSocket port for extension bridge

MCP_USE_EXTENSION

false

Set to true to require extension mode

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