Browser3 Python client

The browser3 package is a small Windows x64 orchestrator. It does not contain Chromium or fingerprint-masking code. The first runtime is pinned to 149.0.7827.201-r3 and is downloaded only by an explicit install or first launch.

python -m pip install browser3
browser3 install
browser3 launch --profile 1

The runtime pin can be selected explicitly for one command with browser3 launch --runtime-version <version>, or persistently for the process with BROWSER3_VERSION. The launcher arguments come after the Browser3 options, for example browser3 launch --runtime-version 149.0.7827.201-r3 --profile 1.

The client verifies the detached OpenPGP signature of SHA256SUMS.txt, checks the ZIP SHA-256, rejects unsafe archives, and activates a versioned cache below %LOCALAPPDATA%\\Browser3\\browsers. It never silently upgrades Chromium. Use browser3 update <version> for an explicit upgrade; older runtimes remain available for rollback. BROWSER3_VERSION selects a supported pin and BROWSER3_BINARY_PATH selects an absolute, user-managed chrome.exe (which the client does not claim to have verified as an official release). The override only changes the executable selected by the verified runtime's launcher: browser3 launch still requires the signed runtime root (including launcher.py and the orchestration modules) to be installed. It never allows an unverified custom directory to supply the launcher or profile-management code. Accordingly, browser3 doctor reports an override-only state as unhealthy until that verified runtime root is present.

The Browser3 name/PyPI publication remains owner-controlled; building this wheel or source distribution does not publish it.