clark-browser chromium-v148.0.7778.96 stealth2

Summary

Linux x64 binary release for clark-browser chromium-v148.0.7778.96-stealth2.

This release makes the Python auto-download path point at the new stealth2 binary and ships the next round of browser-level fingerprint coherence fixes.

Included

• Auto-download release tag updated to chromium-v148.0.7778.96-stealth2 so fresh installs fetch this build.
• Linux platform/font defaults are now coherent instead of mixing a Windows profile with a tiny Linux font surface.
• Notification.permission now returns default directly while permissions.query({name: "notifications"}) returns prompt.
• Network Information values (effectiveType, rtt, downlink, saveData) are seed/profile-derived, including datacenter/mobile-style profiles.
• Added opt-in proxy-coherent WebRTC policy controls for HTTP proxy users.
• Added WebGPU adapter-info coherence when WebGPU is available, and made headless WebGPU absence part of the profile rather than accidental drift.
• Added launch hygiene warnings for risky DevTools/CDP/automation flags and an InteractionPacer helper for less bursty automation.

Verification

• Local python3 -m pytest tests/test_imports.py: 32 passed.
• Local syntax/checks: py_compile, bash -n, and git diff --check passed during release prep.
• Built on AWS c7i.8xlarge with the Linux Docker build pipeline.
• In-container smoke against the freshly built headless_shell: passed.
• Extracted release tarball smoke against dist/clark-browser-linux-x64.tar.gz: passed.

Artifact

• clark-browser-linux-x64.tar.gz
• SHA-256: df7a3333ddf75634977a3d93ecc0c6795db81c8f4f43d5a57e81afb92f85e27b

Note: the live detector table in the repo is still the stealth1 snapshot unless separately rerun; this release is verified by source tests, c7 build, in-container smoke, and extracted-tarball smoke.

clark-browser chromium-v148.0.7778.96 stealth1

What's new

This is a stealth refresh of the Clark browser Linux binary for the Chromium 148.0.7778.96 line.

• Makes Notification.permission and the permissions query surface report a prompt/default-compatible state under Clark fingerprint mode, fixing the sannysoft HEADCHR_PERMISSIONS failure.
• Seeds coherent desktop screen metrics, including screen.width, screen.height, avail*, outer*, DPR, and 24-bit color depth.
• Adds a platform-aware WebGL GPU fallback with Chrome-like WebGL version/shading strings and a Chrome-ish extension allowlist.
• Enables Clark runtime noise defaults for client rects, canvas measureText, and canvas image data.
• Hardens the Linux and E2B smoke suites for UA-CH, WebGL, sannysoft, audio, and canvas seed-differential behavior.
• Fixes background Linux build container launch ordering.

Binary

Asset: clark-browser-linux-x64.tar.gz

SHA256:

902934003d3183dc13fd254ef14d9286a8b47396414e9f851801479c3b3fb4a9

Verification

• Local Python syntax checks and import tests passed.
• Patch dry-runs passed against the Chromium source snapshot for notification, screen, and WebGL patches.
• AWS c7i.4xlarge Linux build completed and in-container smoke passed.
• Actual E2B Ubuntu 24.04 sandbox with agent-browser 0.27.0 passed tests/integration_smoke.py --webgl, including UA/UA-CH, WebGL NVIDIA ANGLE fallback, sannysoft HEADCHR checks, notification permissions, audio seed differential, and canvas seed differential.

Live detector sweep (2026-05-20)

Run environment: E2B Ubuntu 24.04 sandbox, agent-browser 0.27.0, released Linux binary downloaded from this GitHub release and SHA256-verified.

Target	Result	Evidence
Baseline JS/CDP probe	PASS	navigator.webdriver=false, plugins.length=5, platform=Win32, coherent 1440x900 screen, WebGL Google Inc. (NVIDIA) / ANGLE (...) Direct3D11; permissions query returned prompt.
Cloudflare challenge smoke (nowsecure.nl)	PASS	Loaded target without visible challenge/block text.
SannySoft	PASS	WebDriver missing, Chrome present, HEADCHR UA/permissions/plugins/iframe all ok.
Antoine Vastel headless test	FAIL	Explicit verdict: You are Chrome headless.
BrowserLeaks Client Hints	PASS	Windows + Google Chrome UA-CH, no HeadlessChrome.
BrowserLeaks WebGL	PASS	Google/NVIDIA ANGLE, WebGL/WebGL2 enabled, no SwiftShader/llvmpipe text.
Incolumitas, Pixelscan, BotD demo, CreepJS	OBSERVED	Loaded and captured; no stable passive verdict for several pages. CreepJS still shows a Headless panel.

Full table and raw captured JSON are published in the repo:
docs/bot-detection-results.md.

Antoine Vastel follow-up

The original live detector sweep marked Antoine Vastel's headless test as failed. Follow-up investigation isolated this to the HTTP Accept-Language header rather than a JS-only browser surface.

Targeted E2B + agent-browser rerun using the same released binary:

Launch variant	Antoine result
Without --accept-lang	You are Chrome headless
With --accept-lang=en-US,en	You are not Chrome headless

clarkbrowser.get_default_stealth_args() and the smoke tests now include --accept-lang=en-US,en; the public results table has been updated with the follow-up evidence.

clark-browser chromium-v148.0.7778.96

Linux x64 build with coherent UA Client Hints / navigator.userAgentData fingerprinting. Includes headless_shell, chrome compatibility launcher, headless resource packs, and runtime helper libraries. Built on AWS c7i.8xlarge with host-memory Docker runner. In-container build-output smoke and extracted-tarball smoke both passed. SHA-256: d58fe7380092d4a382ccbf75b85d0288caafb4ab79972984c6865858a196abf8.

clark-browser v148.0.7778.96-stealth0

ungoogled-chromium 148.0.7778.96 + clark stealth patches. Linux x86_64 + macOS arm64.