CloakBrowser is a custom Chromium distribution for developers building browser automation with Playwright, Puppeteer, Selenium, or CDP. Instead of relying only on runtime JavaScript patches, it changes browser behavior at the Chromium source level while preserving familiar automation APIs. Teams can adapt existing Python, JavaScript, and .NET workflows with minimal code changes and run sessions on Windows, macOS, Linux, Docker, or their own VPS infrastructure. Features include persistent profiles, reproducible browser identities, proxy-aware locale and timezone configuration, human-like input timing, and CDP server mode. CloakBrowser is intended for legitimate public-web data collection, QA, monitoring, scraping, and AI-agent workflows. The developer wrapper is MIT-licensed, while current custom Chromium binaries are distributed separately under a proprietary license. Users provide their own proxies and CAPTCHA services.