javascript_execute

MCP tool from Firefox MCP Server by JediLuke

Run custom JavaScript in browser context

How to use it

javascript_execute is exposed by the Firefox MCP Server MCP server. Add the server to your MCP client (Claude Desktop, Cursor, Windsurf and others), and the javascript_execute tool becomes available to the model automatically. See the full listing for setup details and every tool this server provides.

Install Firefox MCP Server

$npx playwright install firefox

FULL FIREFOX MCP SERVER LISTING

Other tools in Firefox MCP Server (27)

Close browser and clean up all resources

Launch Firefox with debugging capabilities

debug_activity_all

Combined feed of all debugging information

debug_buffers_clear

Clear accumulated debug data

debug_console_logs

Monitor browser console output

debug_helpers_inject

Inject custom debugging utilities

debug_javascript_errors

Track JavaScript errors and exceptions

debug_monitoring_start

Start comprehensive monitoring

debug_network_activity

Monitor HTTP requests and responses

debug_performance_metrics

Get timing and memory usage data

debug_websocket_messages

Capture WebSocket traffic (LiveView-friendly)

Click elements by selector or coordinates

Drag and drop with smooth animations

Wait for elements to appear or become visible

/ historyforward - Browser history navigation

Extract HTML content from page or elements

Type text into input fields and text areas

Send keyboard events with modifier support

Navigate to any URL

Refresh current page

page_screenshot

Capture screenshots with flexible options

Close specific session and free resources

Create isolated browser session with independent state

List all active sessions with URLs and status

session_set_active

Set default session for subsequent operations

Get visible text content

url_get_current

Get current page URL