Addfox: Build Better Browser Extensions for Developers and AI

🚀 A new open-source browser extension framework just dropped: Addfox (beta)

👉 https://addfox.dev

👉 github: https://github.com/addfox/addfox

👉 npm: https://www.npmjs.com/package/addfox

If you’ve built extensions recently, you’ve probably used tools like WXT or Plasmo.

They’ve pushed the ecosystem forward a lot — better DX, faster builds, less boilerplate.

But I built something a bit different: Addfox("Addon + Fox"). I want to "Build Better Extensionsfor Developers and AI".

⚡ What is Addfox?

Addfox is a browser extension framework built on top of Rsbuild / Rstack.

• ⚡ Rust-powered build performance
• 🧩 More predictable bundling behavior
• 🧩 Content UI support. Built-in createContentUI method for easy integration of Iframe, ShadowDom, and native content.
• 🧩 Framework agnostic. Vanilla, Vue, React, Preact, Svelte, Solid — use what you like
• 🧩 Zip on build. Build automatically outputs an extension zip package
• 🧩 Enable terminal error output with --debug. Capture all extension errors without browser DevTools, so you can Ask AI directly in any editor
• 🧩 Skills support for Agents
• 🧩 llms.txt and markdown metadata support
• For more features, please visit the official website

📦 Current status

• Beta released
• Core workflow is stable
• Not supporting Safari right now
• Still iterating based on real-world usage

If you’ve ever felt constrained by existing extension frameworks,

or just want something faster and more transparent, give it a try:

👉 https://addfox.dev

Would love to hear how it compares to your current setup.