Rotunda is a Firefox fork built for AI agents, launched by developer Pierce. The browser aims to hide automation traces by simulating human mouse and keyboard input with a neural‑network model trained on real user timings. It runs locally, exposes a Playwright API, and ships with a CLI that manages profiles and daemon sessions for developers who need stealth automation.

Unlike traditional stealth plugins that overwrite JavaScript properties, Rotunda keeps the browser fingerprint authentic and only fakes non‑essential details. The project patches Firefox 150, integrates an agent harness, and provides a human‑like cursor path prediction. Users can drive the browser via Python, uv, or the command line, making it ideal for local agent workloads for data processing and automation testing.

Rotunda’s design responds to the escalating cost of commercial computer‑use models and the brittleness of existing bot‑detection systems. By avoiding deceptive fingerprinting and instead mimicking realistic input noise, it reduces captchas and login blocks in practice. Developers can install it with a single uv command and immediately integrate it into existing Playwright workflows for complex automation pipelines across multiple environments.