Xpersona

Crawler Summary

firefox-devtools-mcp answer-first brief

Model Context Protocol (MCP) server for Firefox DevTools automation Firefox DevTools MCP $1 $1 $1 $1 <a href="https://glama.ai/mcp/servers/@freema/firefox-devtools-mcp"><img src="https://glama.ai/mcp/servers/@freema/firefox-devtools-mcp/badge" height="223" alt="Glama"></a> Model Context Protocol server for automating Firefox via WebDriver BiDi (through Selenium WebDriver). Works with Claude Code, Claude Desktop, Cursor, Cline and other MCP clients. Repository: https://github.com/free Capability contract not published. No trust telemetry is available yet. 55 GitHub stars reported by the source. Last updated 2/25/2026.

Freshness

Last checked 2/25/2026

Best For

firefox-devtools-mcp is best for mcp, mcp-server, model-context-protocol workflows where MCP compatibility matters.

Not Ideal For

Contract metadata is missing or unavailable for deterministic execution.

Evidence Sources Checked

editorial-content, GITHUB MCP, runtime-metrics, public facts pack

CardFactsSnapshotContractTrust
Claim this agent
Agent DossierGitHubSafety: 100/100

firefox-devtools-mcp

Model Context Protocol (MCP) server for Firefox DevTools automation Firefox DevTools MCP $1 $1 $1 $1 <a href="https://glama.ai/mcp/servers/@freema/firefox-devtools-mcp"><img src="https://glama.ai/mcp/servers/@freema/firefox-devtools-mcp/badge" height="223" alt="Glama"></a> Model Context Protocol server for automating Firefox via WebDriver BiDi (through Selenium WebDriver). Works with Claude Code, Claude Desktop, Cursor, Cline and other MCP clients. Repository: https://github.com/free

MCPself-declared

Public facts

5

Change events

1

Artifacts

0

Freshness

Feb 25, 2026

Verifiededitorial-contentNo verified compatibility signals55 GitHub stars

Capability contract not published. No trust telemetry is available yet. 55 GitHub stars reported by the source. Last updated 2/25/2026.

55 GitHub starsTrust evidence available

Trust score

Unknown

Compatibility

MCP

Freshness

Feb 25, 2026

Vendor

Freema

Artifacts

0

Benchmarks

0

Last release

0.7.3

Executive Summary

Key links, install path, and a quick operational read before the deeper crawl record.

Verifiededitorial-content

Summary

Capability contract not published. No trust telemetry is available yet. 55 GitHub stars reported by the source. Last updated 2/25/2026.

View Source

Setup snapshot

git clone https://github.com/freema/firefox-devtools-mcp.git
  1. 1

    Setup complexity is MEDIUM. Standard integration tests and API key provisioning are required before connecting this to production workloads.

  2. 2

    Final validation: Expose the agent to a mock request payload inside a sandbox and trace the network egress before allowing access to real customer data.

Evidence Ledger

Everything public we have scraped or crawled about this agent, grouped by evidence type with provenance.

Verifiededitorial-content
Vendor (1)

Vendor

Freema

profilemedium
Observed Feb 25, 2026Source linkProvenance
Compatibility (1)

Protocol compatibility

MCP

contractmedium
Observed Feb 25, 2026Source linkProvenance
Adoption (1)

Adoption signal

55 GitHub stars

profilemedium
Observed Feb 25, 2026Source linkProvenance
Security (1)

Handshake status

UNKNOWN

trustmedium
Observed unknownSource linkProvenance
Integration (1)

Crawlable docs

6 indexed pages on the official domain

search_documentmedium
Observed Apr 15, 2026Source linkProvenance

Release & Crawl Timeline

Merged public release, docs, artifact, benchmark, pricing, and trust refresh events.

Self-declaredagent-index

Docs Update

Docs refreshed: Sign in to GitHub · GitHub

search_documentmedium

Fresh crawlable documentation was indexed for the official domain.

Observed Apr 15, 2026

Artifacts Archive

Extracted files, examples, snippets, parameters, dependencies, permissions, and artifact metadata.

Self-declaredGITHUB MCP

Extracted files

0

Examples

6

Snippets

0

Languages

typescript

Executable Examples

bash

claude mcp add firefox-devtools npx firefox-devtools-mcp@latest

bash

# Headless + viewport via args
claude mcp add firefox-devtools npx firefox-devtools-mcp@latest -- --headless --viewport 1280x720

# Or via environment variables
claude mcp add firefox-devtools npx firefox-devtools-mcp@latest \
  --env START_URL=https://example.com \
  --env FIREFOX_HEADLESS=true

json

{
  "mcpServers": {
    "firefox-devtools": {
      "command": "npx",
      "args": ["-y", "firefox-devtools-mcp@latest", "--headless", "--viewport", "1280x720"],
      "env": {
        "START_URL": "about:home"
      }
    }
  }
}

bash

npm run setup
# Choose Claude Code; the script saves JSON to the right path

bash

npx @modelcontextprotocol/inspector npx firefox-devtools-mcp@latest --start-url https://example.com --headless

text

screenshot_page({ saveTo: "/tmp/page.png" })
screenshot_by_uid({ uid: "abc123", saveTo: "/tmp/element.png" })

Docs & README

Full documentation captured from public sources, including the complete README when available.

Self-declaredGITHUB MCP

Docs source

GITHUB MCP

Editorial quality

ready

Model Context Protocol (MCP) server for Firefox DevTools automation Firefox DevTools MCP $1 $1 $1 $1 <a href="https://glama.ai/mcp/servers/@freema/firefox-devtools-mcp"><img src="https://glama.ai/mcp/servers/@freema/firefox-devtools-mcp/badge" height="223" alt="Glama"></a> Model Context Protocol server for automating Firefox via WebDriver BiDi (through Selenium WebDriver). Works with Claude Code, Claude Desktop, Cursor, Cline and other MCP clients. Repository: https://github.com/free

Full README

Firefox DevTools MCP

npm version CI codecov License: MIT

<a href="https://glama.ai/mcp/servers/@freema/firefox-devtools-mcp"><img src="https://glama.ai/mcp/servers/@freema/firefox-devtools-mcp/badge" height="223" alt="Glama"></a>

Model Context Protocol server for automating Firefox via WebDriver BiDi (through Selenium WebDriver). Works with Claude Code, Claude Desktop, Cursor, Cline and other MCP clients.

Repository: https://github.com/freema/firefox-devtools-mcp

Note: This MCP server requires a local Firefox browser installation and cannot run on cloud hosting services like glama.ai. Use npx firefox-devtools-mcp@latest to run locally, or use Docker with the provided Dockerfile.

Requirements

  • Node.js ≥ 20.19.0
  • Firefox 100+ installed (auto‑detected, or pass --firefox-path)

Install and use with Claude Code (npx)

Recommended: use npx so you always run the latest published version from npm.

Option A — Claude Code CLI

claude mcp add firefox-devtools npx firefox-devtools-mcp@latest

Pass options either as args or env vars. Examples:

# Headless + viewport via args
claude mcp add firefox-devtools npx firefox-devtools-mcp@latest -- --headless --viewport 1280x720

# Or via environment variables
claude mcp add firefox-devtools npx firefox-devtools-mcp@latest \
  --env START_URL=https://example.com \
  --env FIREFOX_HEADLESS=true

Option B — Edit Claude Code settings JSON

Add to your Claude Code config file:

  • macOS: ~/Library/Application Support/Claude/Code/mcp_settings.json
  • Linux: ~/.config/claude/code/mcp_settings.json
  • Windows: %APPDATA%\Claude\Code\mcp_settings.json
{
  "mcpServers": {
    "firefox-devtools": {
      "command": "npx",
      "args": ["-y", "firefox-devtools-mcp@latest", "--headless", "--viewport", "1280x720"],
      "env": {
        "START_URL": "about:home"
      }
    }
  }
}

Option C — Helper script (local dev build)

npm run setup
# Choose Claude Code; the script saves JSON to the right path

Try it with MCP Inspector

npx @modelcontextprotocol/inspector npx firefox-devtools-mcp@latest --start-url https://example.com --headless

Then call tools like:

  • list_pages, select_page, navigate_page
  • take_snapshot then click_by_uid / fill_by_uid
  • list_network_requests (always‑on capture), get_network_request
  • screenshot_page, list_console_messages

CLI options

You can pass flags or environment variables (names on the right):

  • --firefox-path — absolute path to Firefox binary
  • --headless — run without UI (FIREFOX_HEADLESS=true)
  • --viewport 1280x720 — initial window size
  • --profile-path — use a specific Firefox profile
  • --firefox-arg — extra Firefox arguments (repeatable)
  • --start-url — open this URL on start (START_URL)
  • --accept-insecure-certs — ignore TLS errors (ACCEPT_INSECURE_CERTS=true)

Tool overview

  • Pages: list/new/navigate/select/close
  • Snapshot/UID: take/resolve/clear
  • Input: click/hover/fill/drag/upload/form fill
  • Network: list/get (ID‑first, filters, always‑on capture)
  • Console: list/clear
  • Screenshot: page/by uid (with optional saveTo for CLI environments)
  • Utilities: accept/dismiss dialog, history back/forward, set viewport

Screenshot optimization for Claude Code

When using screenshots in Claude Code CLI, the base64 image data can consume significant context. Use the saveTo parameter to save screenshots to disk instead:

screenshot_page({ saveTo: "/tmp/page.png" })
screenshot_by_uid({ uid: "abc123", saveTo: "/tmp/element.png" })

The file can then be viewed with Claude Code's Read tool without impacting context size.

Local development

npm install
npm run build

# Run with Inspector against local build
npx @modelcontextprotocol/inspector node dist/index.js --headless --viewport 1280x720

# Or run in dev with hot reload
npm run inspector:dev

Troubleshooting

  • Firefox not found: pass --firefox-path "/Applications/Firefox.app/Contents/MacOS/firefox" (macOS) or the correct path on your OS.
  • First run is slow: Selenium sets up the BiDi session; subsequent runs are faster.
  • Stale UIDs after navigation: take a fresh snapshot (take_snapshot) before using UID tools.
  • Windows 10: Error during discovery for MCP server 'firefox-devtools': MCP error -32000: Connection closed

    • Solution 1 Call using cmd (For more info https://github.com/modelcontextprotocol/servers/issues/1082#issuecomment-2791786310)

      "mcpServers": {
  "firefox-devtools": {
    "command": "cmd",
    "args": ["/c", "npx", "-y", "firefox-devtools-mcp@latest"]
  }
}

      The Key Change: On Windows, running a Node.js package via npx often requires the cmd /c prefix to be executed correctly from within another process like VSCode's extension host. Therefore, "command": "npx" was replaced with "command": "cmd", and the actual npx command was moved into the "args" array, preceded by "/c". This fix allows Windows to interpret the command correctly and launch the server.

    • Solution 2 Instead of another layer of shell you can write the absolute path to npx:

      "mcpServers": {
  "firefox-devtools": {
    "command": "C:\\nvm4w\\nodejs\\npx.ps1",
    "args": ["-y", "firefox-devtools-mcp@latest"]
  }
}

      Note: The path above is an example. You must adjust it to match the actual location of npx on your machine. Depending on your setup, the file extension might be .cmd, .bat, or .exe rather than .ps1. Also, ensure you use double backslashes (\\) as path delimiters, as required by the JSON format.

Versioning

  • Pre‑1.0 API: versions start at 0.x. Use @latest with npx for the newest release.

CI and Release

  • GitHub Actions for CI, Release, and npm publish are included. See docs/ci-and-release.md for details and required secrets.

Author

Created by Tomáš Grasl

Contract & API

Machine endpoints, protocol fit, contract coverage, invocation examples, and guardrails for agent-to-agent use.

MissingGITHUB MCP

Endpoints

Dossier APISnapshot APIContract APITrust API

Contract coverage

Status

missing

Auth

None

Streaming

No

Data region

Unspecified

Protocol support

MCP: self-declared

Requires: none

Forbidden: none

Guardrails

Operational confidence: low

No positive guardrails captured.
Invocation examples
curl -s "https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/snapshot"
curl -s "https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/contract"
curl -s "https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/trust"

Reliability & Benchmarks

Trust and runtime signals, benchmark suites, failure patterns, and practical risk constraints.

Missingruntime-metrics

Trust signals

Handshake

UNKNOWN

Confidence

unknown

Attempts 30d

unknown

Fallback rate

unknown

Runtime metrics

Observed P50

unknown

Observed P95

unknown

Rate limit

unknown

Estimated cost

unknown

Do not use if

Contract metadata is missing or unavailable for deterministic execution.
No benchmark suites or observed failure patterns are available.

Media & Demo

Every public screenshot, visual asset, demo link, and owner-provided destination tied to this agent.

Missingno-media
No screenshots, media assets, or demo links are available.

Related Agents

Neighboring agents from the same protocol and source ecosystem for comparison and shortlist building.

Self-declaredprotocol-neighbors
GITLAB_AI_CATALOGgitlab-mcp

Rank

83

A Model Context Protocol (MCP) server for GitLab

Traction

No public download signal

Freshness

Updated 2d ago

MCP
GITLAB_PUBLIC_PROJECTSgitlab-mcp

Rank

80

A Model Context Protocol (MCP) server for GitLab

Traction

No public download signal

Freshness

Updated 2d ago

MCP
GITLAB_AI_CATALOGrmcp-openapi

Rank

74

Expose OpenAPI definition endpoints as MCP tools using the official Rust SDK for the Model Context Protocol (https://github.com/modelcontextprotocol/rust-sdk)

Traction

No public download signal

Freshness

Updated 2d ago

MCP
GITLAB_AI_CATALOGrmcp-actix-web

Rank

72

An actix_web backend for the official Rust SDK for the Model Context Protocol (https://github.com/modelcontextprotocol/rust-sdk)

Traction

No public download signal

Freshness

Updated 2d ago

MCP
Agent hubMore from this sourceMCP agents
Machine Appendix

Contract JSON

{
  "contractStatus": "missing",
  "authModes": [],
  "requires": [],
  "forbidden": [],
  "supportsMcp": false,
  "supportsA2a": false,
  "supportsStreaming": false,
  "inputSchemaRef": null,
  "outputSchemaRef": null,
  "dataRegion": null,
  "contractUpdatedAt": null,
  "sourceUpdatedAt": null,
  "freshnessSeconds": null
}

Invocation Guide

{
  "preferredApi": {
    "snapshotUrl": "https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/snapshot",
    "contractUrl": "https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/contract",
    "trustUrl": "https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/trust"
  },
  "curlExamples": [
    "curl -s \"https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/snapshot\"",
    "curl -s \"https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/contract\"",
    "curl -s \"https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/trust\""
  ],
  "jsonRequestTemplate": {
    "query": "summarize this repo",
    "constraints": {
      "maxLatencyMs": 2000,
      "protocolPreference": [
        "MCP"
      ]
    }
  },
  "jsonResponseTemplate": {
    "ok": true,
    "result": {
      "summary": "...",
      "confidence": 0.9
    },
    "meta": {
      "source": "GITHUB_MCP",
      "generatedAt": "2026-04-16T23:53:51.616Z"
    }
  },
  "retryPolicy": {
    "maxAttempts": 3,
    "backoffMs": [
      500,
      1500,
      3500
    ],
    "retryableConditions": [
      "HTTP_429",
      "HTTP_503",
      "NETWORK_TIMEOUT"
    ]
  }
}

Trust JSON

{
  "status": "unavailable",
  "handshakeStatus": "UNKNOWN",
  "verificationFreshnessHours": null,
  "reputationScore": null,
  "p95LatencyMs": null,
  "successRate30d": null,
  "fallbackRate": null,
  "attempts30d": null,
  "trustUpdatedAt": null,
  "trustConfidence": "unknown",
  "sourceUpdatedAt": null,
  "freshnessSeconds": null
}

Capability Matrix

{
  "rows": [
    {
      "key": "MCP",
      "type": "protocol",
      "support": "unknown",
      "confidenceSource": "profile",
      "notes": "Listed on profile"
    },
    {
      "key": "mcp",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "mcp-server",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "model-context-protocol",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "firefox",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "firefox-devtools",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "browser-automation",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "webdriver-bidi",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "selenium",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "devtools",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "browser-testing",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "web-automation",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "claude",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "claude-ai",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "ai-agent",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "llm",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    },
    {
      "key": "cli",
      "type": "capability",
      "support": "supported",
      "confidenceSource": "profile",
      "notes": "Declared in agent profile metadata"
    }
  ],
  "flattenedTokens": "protocol:MCP|unknown|profile capability:mcp|supported|profile capability:mcp-server|supported|profile capability:model-context-protocol|supported|profile capability:firefox|supported|profile capability:firefox-devtools|supported|profile capability:browser-automation|supported|profile capability:webdriver-bidi|supported|profile capability:selenium|supported|profile capability:devtools|supported|profile capability:browser-testing|supported|profile capability:web-automation|supported|profile capability:claude|supported|profile capability:claude-ai|supported|profile capability:ai-agent|supported|profile capability:llm|supported|profile capability:cli|supported|profile"
}

Facts JSON

[
  {
    "factKey": "docs_crawl",
    "category": "integration",
    "label": "Crawlable docs",
    "value": "6 indexed pages on the official domain",
    "href": "https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fopenclaw%2Fskills%2Ftree%2Fmain%2Fskills%2Fasleep123%2Fcaldav-calendar",
    "sourceUrl": "https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fopenclaw%2Fskills%2Ftree%2Fmain%2Fskills%2Fasleep123%2Fcaldav-calendar",
    "sourceType": "search_document",
    "confidence": "medium",
    "observedAt": "2026-04-15T05:03:46.393Z",
    "isPublic": true
  },
  {
    "factKey": "vendor",
    "category": "vendor",
    "label": "Vendor",
    "value": "Freema",
    "href": "https://github.com/freema/firefox-devtools-mcp#readme",
    "sourceUrl": "https://github.com/freema/firefox-devtools-mcp#readme",
    "sourceType": "profile",
    "confidence": "medium",
    "observedAt": "2026-02-25T02:58:28.604Z",
    "isPublic": true
  },
  {
    "factKey": "protocols",
    "category": "compatibility",
    "label": "Protocol compatibility",
    "value": "MCP",
    "href": "https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/contract",
    "sourceUrl": "https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/contract",
    "sourceType": "contract",
    "confidence": "medium",
    "observedAt": "2026-02-25T02:58:28.604Z",
    "isPublic": true
  },
  {
    "factKey": "traction",
    "category": "adoption",
    "label": "Adoption signal",
    "value": "55 GitHub stars",
    "href": "https://github.com/freema/firefox-devtools-mcp",
    "sourceUrl": "https://github.com/freema/firefox-devtools-mcp",
    "sourceType": "profile",
    "confidence": "medium",
    "observedAt": "2026-02-25T02:58:28.604Z",
    "isPublic": true
  },
  {
    "factKey": "handshake_status",
    "category": "security",
    "label": "Handshake status",
    "value": "UNKNOWN",
    "href": "https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/trust",
    "sourceUrl": "https://xpersona.co/api/v1/agents/mcp-freema-firefox-devtools-mcp/trust",
    "sourceType": "trust",
    "confidence": "medium",
    "observedAt": null,
    "isPublic": true
  }
]

Change Events JSON

[
  {
    "eventType": "docs_update",
    "title": "Docs refreshed: Sign in to GitHub · GitHub",
    "description": "Fresh crawlable documentation was indexed for the official domain.",
    "href": "https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fopenclaw%2Fskills%2Ftree%2Fmain%2Fskills%2Fasleep123%2Fcaldav-calendar",
    "sourceUrl": "https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fopenclaw%2Fskills%2Ftree%2Fmain%2Fskills%2Fasleep123%2Fcaldav-calendar",
    "sourceType": "search_document",
    "confidence": "medium",
    "observedAt": "2026-04-15T05:03:46.393Z",
    "isPublic": true
  }
]

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Ads related to firefox-devtools-mcp and adjacent AI workflows.