MCP Servers

Playwright MCP Server

Enables browser automation via the Model Context Protocol, supporting headless Playwright and extension bridges for controlling existing Chrome and Firefox tabs.

README

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

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.

Go to chrome://extensions → Load unpacked → select extension/
Start the MCP server: node dist/index.js
Click the extension icon → Connect
Use extension_* tools

Firefox Extension (`extension-firefox/`)

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

Go to about:debugging#/runtime/this-firefox → Load Temporary Add-on → select extension-firefox/manifest.json
Start the MCP server: node dist/index.js
Click the extension icon → Connect
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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