Ghostfox

The agent-native stealth browser you can own.

Self-hosted · Open source · MCP-first · Engine-level anti-detect

· Docs site

AI agents get blocked. Headless Chrome triggers Cloudflare 403s on ~20% of the web, and hosted "stealth browsers" route your agent's cookies, identities and sessions through someone else's cloud.

Ghostfox is the alternative: a complete browser stack you run yourself — a fingerprint-coherent stealth engine plus a Rust MCP runtime, in one repo.

Firefox (MPL-2.0)
  └─ Camoufox (anti-detect patches, by daijro)
       └─ Ghostfox engine          engine/   — spoofing at the C++ level
            └─ Ghostfox runtime     runtime/  — Rust: sessions, identities, MCP

The moat — why this isn't just another wrapper.

1. We own the engine. The anti-detect lives in C++ patches inside our own Firefox fork — not in injected JS that detectors can read. Upstream Camoufox has signaled partially-closed patches ahead; wrappers inherit that risk, a fork that owns its engine doesn't.
2. A living proof corpus. Every claim here has a receipt: bilibili icon-click ×6, hCaptcha on production signups, TikTok OAuth+OTP live, 500/500 identity audits, Docker E2E. Features get copied in a week — verified history can't be.
3. Agent-native ergonomics. 43 coherent MCP tools, fire-then-verify receipts, evidence recording, and a playbook (AGENTS.md) distilled from real runs. Agents (and their prompts) build habits on this surface — switching costs are real.
4. Canonical distribution. PyPI, npm, GHCR and the official MCP Registry under one name, with the docs, benchmarks and changelogs to back it. Forks will exist; the verified trunk is here.

Captcha suite — 8 families, solved on-device (v0.6.7+). The runtime ships native MCP solvers with local models — no paid captcha farms, no cloud, no browser rent:

E2E-verified against production sites (not vendor demos): bilibili icon-click ×6 "Verification Succeeded", hCaptcha on real signups (dashboard.hcaptcha.com, dosya.co), TikTok OAuth+OTP live session.

Debug cortex — page tools that tell you WHY (v0.7). Agents stop guessing when a page misbehaves:

• page_console — every console.log/warn/error since load
• page_errors — uncaught JS exceptions with stack traces
• page_network_start/read/body — request/response capture with body fetch

That's the DevTools trio, exposed over MCP.

Multi-model vision (optional). page_vision + page_ocr + page_match_image + page_pixels + page_contrast — wire any vision-capable model (Cloudflare Workers AI, GLM, Qwen, ...) as cross-checks for grid puzzles and layout questions. Keys are optional; the native solvers above run fully local.

Native-sourced observation — page_a11y {"native": true} reads the engine's OWN accessibility tree (Gecko's DocAccessible walk — the ariaSnapshot plumbing), so page scripts cannot tamper with what you see: shadow DOM, iframes and ARIA semantics handled by Gecko itself, richer states (focused/required/checked/expanded/disabled/level). Native refs are observation handles; acting goes through role+name anchors or the JS-walk source.

Eyes for agents — page_a11y. One call returns every visible interactive element with a stable ref, semantic role, accessible name, live value — piercing shadow DOM and same-origin iframes, so web-component UIs (Reddit, modern frameworks) are fully visible. The snapshot also reports login_state (logged-in / logged-out / unknown), page URL and title — agents check session health before acting, not after failing.

Agents act by ref: page_click_ref e38, page_type_ref e21 "text" — no CSS selectors needed. Rich editors (Lexical, Draft, ProseMirror) are handled via editor-native input paths with fire-then-verify receipts. page_wait_for replaces manual sleeps. page_read_ref gives full untruncated values. page_upload_file bypasses native file pickers.

Android personas too — session_create {"platform": "android"} gives portrait screens, Adreno/Mali GPUs, Android font stacks and Firefox-on-Android UAs, all audited like desktop identities (500/500 coherent, see runtime/docs).

One identity, no contradictions. Identities are generated from coherent device presets (platform, screen, GPU, fonts that actually ship together), injected at the engine level, and audited before use — a spoofed browser's worst enemy is itself saying "4 cores on a MacBook".

Quickstart

Pick a distribution:

# Python (Linux x86_64)
pip install ghostfox
python -c "import ghostfox; ghostfox.install_engine(); ghostfox.install_runtime()"

# npm / any MCP host
npm install -g ghostfox        # or: npx ghostfox install
{
  "mcpServers": {
    "ghostfox": { "command": "npx", "args": ["-y", "ghostfox", "mcp"] }
  }
}

# Docker (engine + MCP runtime, ubuntu:24.04 base)
docker run -i --rm ghcr.io/autokeren/ghostfox:v0.7.2
# or one-line install of the binary stack:
curl -fsSL https://raw.githubusercontent.com/autokeren/ghostfox/main/install.sh | bash

Also listed on the official MCP Registry (io.github.autokeren/ghostfox) — one-click add in registry-aware clients.

From source:

# 1) Get the engine (prebuilt) and unpack it somewhere, e.g. /opt
unzip ghostfox-<ver>-lin.x86_64.zip -d /opt/ghostfox

# 2) Build the runtime
git clone https://github.com/autokeren/ghostfox.git
cd ghostfox/runtime
cargo build --release

{
  "mcpServers": {
    "ghostfox": {
      "command": "/path/to/ghostfox/runtime/target/release/ghostfox-mcp",
      "env": { "GHOSTFOX_HOME": "/opt/ghostfox" }
    }
  }
}

Then the agent can: session_create → page_open → page_a11y → act by ref.

Portable sessions. session_create accepts profile_dir for persistent profiles: cookies, storage and the identity TOML live together in one place, so a login survives restarts. Migrating a session from another Camoufox-lineage browser? Copy the cookies and match the identity to the origin device (platform, timezone, locale, screen) — a session that suddenly changes identity looks like an impossible login and anti-fraud systems revoke it. Proven flow, see AGENTS.md §8.

Full tool surface (70 tools) — two tiers, one binary:

• core (default): 26 curated tools — the golden loop (read → act → verify) plus debugging essentials, zero overlapping variants. This is what agents and registry inspectors see out of the box: an efficient, disambiguated surface (each tool's description says when to prefer it).
• full: all 70 tools — captcha families, pixel/vision tiers, network interception, WebSocket capture/inject/block, identity morph, chrome-mode, Android. Run the server with GHOSTFOX_TOOLSET=full.

The server also publishes instructions (a decision tree agents read before choosing tools) — the disambiguation layer for both tiers.

Every mutation returns a receipt — page_fill reports landed_chars, while type_ref fire-then-verifies async editors, so a silent page swap can't eat an edit unnoticed. Sessions can also run headful ({"headful": true}) when humans want to watch the agent work.

Every run records evidence. Each session writes an append-only event log (events.jsonl), full page snapshots and the identity it used under ~/.ghostfox/recordings/ — fetch it any time with session_evidence.

E2E without emulators: Flutter web + any web app

Android E2E normally means emulators, Appium and a farm of devices. Ghostfox takes the web route: build the Flutter app for the web (flutter build web — same Dart codebase) and drive it with the same senses used against hostile sites:

• Semantics tree, read natively — Flutter's a11y nodes (roles, labels, bounds) land in page_a11y(native=true) once semantics are enabled (one line in the app: SemanticsBinding.instance.ensureSemantics()).
• Native clicks — page_click_native fires the Flutter buttons at their trusted a11y coordinates (verified: submit triggers, status renders).
• Receipts + page_diff + page_mutations + page_wait_stable — the same Act→Observe→Compare evidence loop, no polling guesswork.
• Visual QA — page_ui_audit judges the rendered UI.

Honest scope: logic/flow/UI = fully covered; final visual parity with real devices (Impeller rendering) and platform channels (sensors, camera) still need a device or emulator pass.

Sponsor

Ghostfox is independent and self-funded. If it saves your team from captcha walls or vibe-code UI bugs, help keep the house open:

• GitHub Sponsors — monthly support, any amount
• Buy Me a Coffee — one-time

Companies: sponsorship + early access to the hosted Visual QA service is open — sponsor the repo or open an issue with the title sponsorship.

Or install in one command (Linux x86_64):

curl -fsSL https://raw.githubusercontent.com/autokeren/ghostfox/main/install.sh | bash

From source end-to-end (build the engine yourself): see engine/README.md — make dir && make build.

Repository layout

runtime/   Rust: ghostfox-{core,fingerprint,mcp,eval}     (MIT OR Apache-2.0)
engine/    Browser fork: patches, branding, build system    (MPL-2.0)
AGENTS.md  The agent playbook — how AI agents drive Ghostfox like a human
SKILL.md   The compact agent skill — the golden loop + tool map at a glance
docs/JOURNEY.md  The dev-log, todo list and the road ahead (the five senses)

Two directories, two licenses, one product. The runtime speaks Juggler natively — no Node, no Python at runtime.

Using Ghostfox with an AI agent (opencode, Codex, Cursor, Claude Code, ...)? Read AGENTS.md first — it's the distilled playbook from real agent runs: the READ → REASON → DECIDE → ACT loop, self-health (rate limits, drafts, notifications), rich-editor typing, and every known wall with its proven solution.

Why own the engine?

• Anti-detect that survives inspection. Spoofing happens inside the engine (navigator, screen, WebGL, fonts, WebRTC, timezone, audio) — not in injected JS that detectors can read.
• No cloud dependency. Your agent's identities and cookies never touch a third-party host.
• Upstream insurance. engine/ tracks daijro/camoufox as upstream; Ghostfox applies its own branding and can rebase whenever it wants — including if upstream patches go closed-source.

Status

v0.7 — alpha. Verified: identity coherence (500/500), full MCP round-trip E2E (create → open → fill → submit), 8 captcha families E2E on production sites (bilibili, hCaptcha-protected signups, TikTok), debug cortex (console/errors/network), Docker image E2E (session → open → snapshot inside a container), portable sessions across Camoufox-lineage browsers. Distributed via PyPI, npm, Docker (GHCR) and the official MCP Registry. Known limits are tracked in the changelogs under runtime/ and engine/.

Do not use against targets you don't have permission to test. This is a testing / research tool.

Credits

Ghostfox stands on the shoulders of giants — Camoufox (daijro) for the anti-detect patch stack, Mozilla Firefox for the engine, LibreWolf for the patch tooling lineage, and Playwright for the Juggler protocol.

License

• engine/ — MPL-2.0 (inherited from Firefox / Camoufox). See engine/LICENSE.
• runtime/ — MIT OR Apache-2.0. See runtime/LICENSE-MIT.