Selenium gets caught by anti-bots and captchas.
This one runs on an anti-detect Firefox with an undetected fingerprint, compatible with your existing Selenium code.

How it works

Anti-bots ask two questions, and reCAPTCHA, hCaptcha and Cloudflare Turnstile score the answers. invisible_selenium answers yes to both.

1. Is this a real browser? Yes. It is Firefox, patched at the C++ source level.

• The browser fingerprint is set inside the engine, not injected into the page: navigator, screen, GPU/WebGL, canvas, fonts, audio, WebRTC, timezone, network. Headless or headed, the same values either way.
• No geckodriver and no Marionette, so nothing turns navigator.webdriver on, and no JavaScript shim for a page to find.

2. Is a real person using it? Yes. The actions are humanized in the driver.

• Every click, hover and drag follows a natural mouse path with human timing, no teleporting cursor.
• Input goes through the browser's real input path, so the page sees trusted events.

Install

pip install invisible-selenium
python -m invisible_selenium fetch      # one-time download of the patched Firefox, sha256-verified

Requires Python 3.11 or newer. Supported platforms: Windows x86_64 / ARM64 (the x86_64 engine, under Windows' own emulation), Linux x86_64 / arm64.

Usage

Selenium's API, with no code changes. The same webdriver, By, WebDriverWait and expected_conditions. If you already use Selenium, switching is the import:

- from selenium import webdriver
- from selenium.webdriver.common.by import By
+ from invisible_selenium import webdriver
+ from invisible_selenium.webdriver.common.by import By

from invisible_selenium import webdriver
from invisible_selenium.webdriver.common.by import By
from invisible_selenium.webdriver.support.ui import WebDriverWait
from invisible_selenium.webdriver.support import expected_conditions as EC

driver = webdriver.Firefox()
driver.get("https://example.com")
WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.TAG_NAME, "a"))).click()  # the mouse arcs to the link
print("seed =", driver.seed)   # log it to replay the run
driver.quit()

Every session gets a distinct fingerprint (GPU, audio, fonts, screen, ~200 fields). Do not install Selenium alongside it: this package already implements its API.

Options

driver = webdriver.Firefox(
    seed=42,                        # same seed, same fingerprint, every run
    proxy={"server": "socks5://host:1080", "username": "u", "password": "p"},
    timezone="America/New_York",    # default: derived from the proxy's exit IP
    pin={"screen.width": 2560, "screen.height": 1440},   # force fields, the rest stays seed-derived
    headless=True,                  # hidden desktop, real rendering: same fingerprint as headed
    profile_dir="./profile",        # cookies and storage survive the run
)

Proxies can be socks5, socks4, http or https, and DNS goes through them too. FirefoxOptions work as they do in Selenium, -headless included. The fields you can pin are the same as in invisible_playwright: pinning.

CLI

invisible-selenium fetch      # download the engine if missing, check every cached one, print the path
invisible-selenium version    # wrapper, core and engine versions

Related projects

• invisible_playwright: the same engine with Playwright's API, and the guides on how detection works.
• invisible_puppeteer: the same engine with Puppeteer's API, in Python.
• invisible_playwright_mcp: the same engine for AI agents, over MCP.
• invisible_core: turns a seed into a fingerprint and the fingerprint into Firefox preferences. This package depends on an exact version of it.
• firefox_antidetect_patch: the C++ patches that build the browser.

Switching from another tool?

• selenium-stealth: it patches the page from JavaScript, and its last commit is from December 2021. What that means.

Development

git clone https://github.com/feder-cr/invisible_selenium && cd invisible_selenium
uv venv && uv pip install -e ".[dev]"
uv run pytest -q                      # unit
uv run pytest -q -m e2e               # against the real browser

License

MIT, see LICENSE. The Juggler client it drives the browser with lives in invisible-core, which carries two files taken from Playwright's driver under Apache-2.0. The patched Firefox binary is MPL-2.0, built from feder-cr/firefox_antidetect_patch.

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.

Built by Federico Elia