What is the key difference between Firefox Devtools MCP and Selenium MCP?

Firefox Devtools MCP belongs to the Browser Automation category with local stdio execution, while Selenium MCP belongs to the Browser Automation category with local stdio execution.

How do I install Firefox Devtools MCP or Selenium MCP in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Firefox Devtools MCP and Selenium MCP free or paid?

Firefox Devtools MCP operates under a Free / Open Source model (No auth required). Selenium MCP operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Firefox Devtools MCP lists 34 tools with 2 views and 428 GitHub stars. Selenium MCP lists 85 tools with 6 views and 1 GitHub stars.

Can I use both Firefox Devtools MCP and Selenium MCP together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Firefox Devtools MCP vs Selenium MCP

In-depth architectural comparison of the Firefox Devtools MCP and Selenium MCP MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Firefox Devtools MCP

Browser Automation · Local stdio

Quality: 65/100 (Great) | Auth: No auth required

Selenium MCP

Browser Automation · Local stdio

Quality: 60/100 (Good) | Auth: No auth required

Verdict Summary: Choose Firefox Devtools MCP if you need specialized Browser Automation tools running via a local process. Choose Selenium MCP if your workspace requires Browser Automation integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Firefox Devtools MCP when:

You need dedicated capabilities in the Browser Automation domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
You have access to required keys: START_URL, FIREFOX_HEADLESS, ACCEPT_INSECURE_CERTS, CONNECT_EXISTING, MARIONETTE_PORT, TOOL_PRESET, ENABLE_SCRIPT, ENABLE_PRIVILEGED_CONTEXT.
Primary tools included: list_pages, new_page, navigate_page.

Explore Firefox Devtools MCP Details

Choose Selenium MCP when:

You need dedicated capabilities in the Browser Automation domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
Primary tools included: .

Feature & Specification Comparison

Specification	Firefox Devtools MCP freema Browser Automation	Selenium MCP seleniumboot Browser Automation
Summary
Category & Scope	Browser Automation	Browser Automation

Tools & Capabilities Breakdown

Firefox Devtools MCP Tools (34)

list_pages

List open tabs (index, title, URL). Selected tab is marked.

new_page

Open new tab at URL. Returns tab index.

navigate_page

Navigate selected tab to URL.

select_page

Select active tab by index, URL, or title. Index takes precedence.

close_page

Close tab by index.

get_page_text

Get the visible text of the page (document.body.innerText). Caps at maxLength (default 20000 chars); saveTo saves the full text to a file.

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Firefox Devtools MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "freema-firefox-devtools-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mozilla/firefox-devtools-mcp@latest"
      ],
      "env": {
        "START_URL": "YOUR_START_URL_HERE",
        "FIREFOX_HEADLESS": "YOUR_FIREFOX_HEADLESS_HERE",
        "ACCEPT_INSECURE_CERTS": "YOUR_ACCEPT_INSECURE_CERTS_HERE",
        "CONNECT_EXISTING": "YOUR_CONNECT_EXISTING_HERE",
        "MARIONETTE_PORT": "YOUR_MARIONETTE_PORT_HERE",
        "TOOL_PRESET": "YOUR_TOOL_PRESET_HERE",
        "ENABLE_SCRIPT": "YOUR_ENABLE_SCRIPT_HERE",
        "ENABLE_PRIVILEGED_CONTEXT": "YOUR_ENABLE_PRIVILEGED_CONTEXT_HERE"
      }
    }
  }
}

Selenium MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "seleniumboot-selenium-mcp": {
      "command": "uvx",
      "args": [
        "seleniumboot-mcp"
      ]
    }
  }
}

Frequently Asked Questions

Firefox Devtools MCP is categorized under Browser Automation and uses a local stdio subprocess. In contrast, Selenium MCP belongs to Browser Automation using local stdio subprocess. Select Firefox Devtools MCP when you need capabilities focused on browser automation and Selenium MCP when you require tools for browser automation.

More alternatives to Firefox Devtools MCP More alternatives to Selenium MCP Browser Automation category hub