invisible_playwright

Stealth Firefox that passes every bot detection test. Drop-in Playwright replacement, fingerprint patched at the C++ level, not a JavaScript shim.

How it works

Most other anti-detect browsers patch Chromium at the JavaScript level - they override navigator, WebGLRenderingContext.getParameter, canvas APIs, and so on via injected scripts. This has two fatal problems:

1. JS patches are detectable. Anti-bots enumerate native function .toString(), check descriptor configurability, compare property enumeration order, watch for prototype mutations. Every patch leaves a fingerprint of its own. CreepJS has an entire battery of "lies detectors" built around this.
2. Chromium itself is now suspect. Forks can’t fully match Chrome: it ships closed-source components (Widevine, proprietary codecs, Safe Browsing) that flip detectable JS flags and network signals, and forks lag Chrome’s release cadence, leaving version-specific tells detectors lock onto.

invisible_playwright patches Firefox at the C++ level — no JS shim, no Object.defineProperty. Spoofed values come out through normal Gecko paths: Navigator, screen, GPU/WebGL, Canvas, fonts, audio, WebRTC, timezone, DevTools, SOCKS5. See feder-cr/invisible_firefox for the full breakdown.

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How it compares

CloakBrowser is closed source (patches not published) and hits the Chromium reCAPTCHA ceiling. Multilogin, GoLogin, AdsPower, Dolphin, Kameleo are paid SaaS running JS-layer spoofing on a patched Chromium.

	invisible_playwright	Camoufox	CloakBrowser	Multilogin
Engine	Firefox 150	Firefox (~1 year old base)	Chromium	Chromium fork
Patch depth	C++ source	C++ source	C++ source	JS overrides
Maintenance	Active	Gap (~1 year)	Active	Active SaaS
Open source	✅ MIT	✅ MPL	❌ Closed source	❌ Closed source
.toString() clean	✅	✅	✅	❌ Detectable shims
Canvas / WebGL / Audio	✅ C++	⚠️ Drift vs current FF	✅ C++	⚠️ JS override
SOCKS5 auth	✅ Patched	❌	⚠️ Playwright proxy	⚠️ Varies
reCAPTCHA v3 score	0.90	~0.3-0.5	~0.3-0.5	~0.3-0.6
FP Pro - bot detected	✅ Not detected	❌ Detected	❌ Detected	❌ Detected
CreepJS lies	✅ 0	❌ Multiple	✅ 0	❌ Multiple
Cost	Free	Free	Free	From $99/mo

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Install

pip install git+https://github.com/feder-cr/invisible_playwright.git
python -m invisible_playwright fetch      # one-time ~100 MB download, SHA256-verified

Supported platforms: Windows x86_64, Linux x86_64 / arm64, macOS arm64 / x86_64. On macOS the app is ad-hoc signed (not notarized): if Gatekeeper complains, clear the quarantine flag once with xattr -dr com.apple.quarantine on the cached Firefox.app.

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Usage

Random fingerprint per session

100% Playwright-compatible - sync and async, all methods, zero API changes. If you already use Playwright, switching is two lines:

- from playwright.sync_api import sync_playwright
- with sync_playwright() as p:
-     browser = p.firefox.launch()
+ from invisible_playwright import InvisiblePlaywright
+ with InvisiblePlaywright() as browser:

Every session gets a distinct fingerprint (GPU, audio, fonts, screen, ~400 fields) and Bezier-curve mouse motion.

Sync

from invisible_playwright import InvisiblePlaywright

with InvisiblePlaywright(proxy={"server": "socks5://...", "username": "u", "password": "p"}) as browser:
    page = browser.new_page()
    page.goto("https://example.com")
    page.click("#submit")   # mouse arcs to the button on a Bezier curve

Async

from invisible_playwright.async_api import InvisiblePlaywright

async with InvisiblePlaywright(proxy={"server": "socks5://...", "username": "u", "password": "p"}) as browser:
    page = await browser.new_page()
    await page.goto("https://example.com")
    await page.click("#submit")

The browser object is a playwright.sync_api.Browser / playwright.async_api.Browser - every Playwright method works as-is.

Log the seed to replay a run:

sf = InvisiblePlaywright()
with sf as browser:
    print("seed =", sf.seed)
    # ...

Reproducible fingerprint

with InvisiblePlaywright(seed=42) as browser:
    ...   # same GPU, same canvas hash, same audio context, every run

Proxies

proxy = {
    "server": "socks5://gate.example.com:1080",
    "username": "user",
    "password": "pass",
}
with InvisiblePlaywright(proxy=proxy) as browser:
    ...

Schemes supported: socks5, socks4, http, https. DNS is routed through the proxy by default, no local leak.

Timezone

The browser timezone follows timezone=:

# default: timezone is auto-derived from the egress IP (proxy egress if a
# proxy is set, otherwise the host's own public IP)
with InvisiblePlaywright(proxy=proxy) as browser:
    ...

# explicit IANA zone always wins — the only way to force a specific zone
with InvisiblePlaywright(proxy=proxy, timezone="America/New_York") as browser:
    ...

Pinning specific fingerprint fields

By default everything comes from seed. To force specific values while the rest stays seed-derived:

with InvisiblePlaywright(
    seed=42,
    pin={
        "gpu.renderer": "ANGLE (NVIDIA, NVIDIA GeForce RTX 4090 Direct3D11)",
        "gpu.vendor":   "Google Inc. (NVIDIA)",
        "screen.width":  2560,
        "screen.height": 1440,
        "hardware.concurrency": 16,
    },
) as browser:
    ...

Full list of pinnable keys, how pinning interacts with the Bayesian sampler, and common patterns are in docs/pinning.md.

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CLI

invisible_playwright fetch          # download the binary if missing
invisible_playwright fetch --force  # re-download even if cached
invisible_playwright path           # print the absolute path to the cached binary
invisible_playwright version        # wrapper and binary versions
invisible_playwright clear-cache    # remove all cached binaries

Related projects

Related projects that cover similar ground:

• arkenfox/user.js - Firefox privacy hardening via prefs. invisible_playwright patches C++ where prefs are insufficient.
• LibreWolf - Firefox fork with privacy defaults. LibreWolf ships a configured binary; invisible_playwright ships source patches + automation wrapper.
• Camoufox - open-source anti-detect Firefox. Patches a wider surface and ships its own fingerprint database; invisible_playwright uses a Bayesian sampler.

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License

MIT - see LICENSE. The patched Firefox binary is distributed under the MPL-2.0 (Firefox upstream license). The C++ patches against mozilla-central that produce that binary are at feder-cr/invisible_firefox.

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Disclaimer

This project is for educational purposes only. It is provided as-is, with no warranties. I take no responsibility for how it is used. Use it at your own risk and in compliance with the laws of your jurisdiction.