AddFox

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AddFox is an open-source browser extension development framework built on Rsbuild, designed to accelerate development for both developers and AI. It offers fast HMR, multi-browser support, and AI-friendly debugging features.

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At a glance

Pricing

Open Source

Free tier

Yes

API

Skill level

Technical

About

What is AddFox?

AddFox is an open-source browser extension development framework built on Rsbuild, providing a comprehensive set of tools and features for developing browser extensions. It accelerates development with fast HMR, multi-browser support for Chromium-based browsers and Firefox, and minimal configuration. AddFox is framework-agnostic, supporting Vanilla, Vue, React, Preact, Svelte, Solid, and React+UnoCSS. It also includes built-in content UI support for easy integration of Iframe, ShadowDom, and native content. For AI, AddFox offers structured meta, terminal error output, and Skills support, enabling AI agents to understand and work with extensions more effectively. It provides clear extension info, error details, and prompts to help AI agents develop and debug.

Best used for

Ideal for startup founders and developers who need to rapidly build browser extensions, debug them efficiently with AI assistance, and ensure multi-browser compatibility. Especially valuable for those looking to integrate AI capabilities into their extensions and streamline the development workflow.

Common actions

develop browser extensions

debug extensions

accelerate development

integrate AI tools

AI developmentAI IntegrationBrowser ExtensionsDeveloper Toolsproductivity toolsweb developmentextension frameworkmachine learning

Capabilities

Key features

Fast HMR
Multi-browser support
Framework agnostic
Content UI support
AI-friendly error monitoring
Skills support
Zip on build

Target Audience

startup founder

Integrations

Not yet documented

Pricing & Plans

Open Source

Freemium

FAQs

What frontend frameworks does AddFox support?

AddFox is framework-agnostic, supporting a wide range of popular frontend frameworks. You can use Vanilla JavaScript/TypeScript, Vue, React, Preact, Svelte, Solid, or even React with UnoCSS, allowing you to build extensions with your preferred technology stack.

Which browsers are supported by AddFox?

AddFox provides comprehensive support for mainstream Chromium-based browsers such as Chrome, Edge, Arc, and Brave. It also fully supports Firefox. Safari is not currently supported due to its distinct extension API and packaging requirements.

How does AddFox assist with AI-driven development?

AddFox supports AI-driven development through structured metadata, terminal error output, and an extensible Skills system. It provides clear extension information, error details, and prompts to help AI agents understand, develop, and debug extensions, enhancing automation and efficiency.

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