Zen Browser is a free and open-source fork of Mozilla Firefox introduced in 2024, with a focus on privacy, customizability and design.
Zen includes many of the layout changes and features associated with the Chromium-based web browser Arc. After The Browser Company announced the Arc browser was no longer going to receive new features, Zen has been considered a major alternative and a continuation in spirit.
It is licensed under the terms of the Mozilla Public License 2.0.