Addfox is a browser extension development framework designed to accelerate the creation of extensions for developers and AI applications. Built on Rsbuild, it emphasizes speed and simplicity, providing a free solution for building extensions with minimal configuration. The framework supports hot reload, enabling rapid development cycles, and offers a dedicated reloader for ultra-fast hot module replacement in both content scripts and background processes.
Addfox is framework agnostic, allowing developers to use technologies such as Vanilla JavaScript, Vue, React, Preact, Svelte, Solid, or React combined with UnoCSS. It includes built-in methods for integrating content UIs using Iframe, ShadowDom, and native content, making it adaptable for a range of extension interfaces. The tool supports mainstream Chromium-based browsers as well as Firefox, automatically detecting browser install paths and launching without manual configuration. Addfox also features multi-browser support and outputs a zipped extension package for straightforward installation and distribution.
The development environment includes a dev server and provides minimal build times, as highlighted by benchmark comparisons with other tools. Addfox integrates with the Rstack ecosystem, offering built-in support for Rsdoctor and Rstest to facilitate bundle analysis and both unit and end-to-end testing. txt and markdown formats, enabling AI agents to understand, monitor, and interact with extension development. Terminal error output and AI-friendly error monitoring are available, allowing developers to capture and analyze extension errors without relying on browser DevTools.
Addfox is delivered as a command-line tool, installable via npx, and is available at no cost. Its extensible Skills system supports agents and automation for tasks such as migration, best practices, debugging, and testing. The framework is positioned as a solution for developers seeking to build, test, and distribute browser extensions efficiently across multiple browsers and front-end frameworks.
Addfox is a Frameworks & SDKs product. It focuses on accelerating and simplifying the development of browser extensions for developers. Addfox is an open-source project aimed at browser extension developers. Addfox costs nothing to use. Addfox is available on the web and the command line.
Addfox first shipped in 2026. The project is developed in the open on GitHub with 118 stars and 60 commits in the last 90 days. Across PulseGate's embedding index, Addfox has few near neighbours, marking it as relatively distinct. Among its 5 catalogued features are extension scaffolding, hot reload, and dev server.
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