What is the key difference between Firefox Devtools MCP and MCP Accessibility Scanner?

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

How do I install Firefox Devtools MCP or MCP Accessibility Scanner 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 MCP Accessibility Scanner free or paid?

Firefox Devtools MCP operates under a Free / Open Source model (No auth required). MCP Accessibility Scanner 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. MCP Accessibility Scanner lists 42 tools with 0 views and 56 GitHub stars.

Can I use both Firefox Devtools MCP and MCP Accessibility Scanner 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 MCP Accessibility Scanner

In-depth architectural comparison of the Firefox Devtools MCP and MCP Accessibility Scanner 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

MCP Accessibility Scanner

Browser Automation · Local stdio

Quality: 61/100 (Good) | Auth: No auth required

Verdict Summary: Choose Firefox Devtools MCP if you need specialized Browser Automation tools running via a local process. Choose MCP Accessibility Scanner 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 MCP Accessibility Scanner 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	MCP Accessibility Scanner Browser Automation
Summary	Firefox browser automation via WebDriver BiDi for testing, scraping, and browser control. Supports snapshot/UID-based interactions, network monitoring, console capture, and screenshots.	MCP server for automated web accessibility scanning with Playwright and Axe-core.
Category & Scope	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"
      }
    }
  }
}

MCP Accessibility Scanner Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "mcp-accessibility-scanner": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-accessibility-scanner"
      ]
    }
  }
}

Frequently Asked Questions

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

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