Hello there! I'm Cezar, browser extension developer and open-source maintainer. I'm building Extension.js, a developer tool that makes it very easy to develop cross-browser extensions.

With Extension.js, developers can go from pnpm extension create to publishing in the Chrome, Firefox, and Edge stores — all with a unified, modern developer experience.

About Extension.js

• 🧰 Used in 600+ active projects as per GitHub
• ⚙️ Templates for React, Vue, Svelte, Preact, vanilla TypeScript, and vanilla JS
• 🛠 Built-in support for WebExtension APIs and Manifest V2/V3
• 🧬 Works cross-browser (Chrome/Edge/Firefox) with a single manifest file

Your sponsorship helps keep Extension.js open, improve docs, ship better templates, and offer devs a seamless way to build extensions that scale.

Founding Members

Founding Members are the first 1,000 sponsors who believe in the mission of makeing browser extension development easy, fast, and reliable across all major browsers. These vanguardists play a fundamental role in shaping the tools, and developer workflows that can define the next era of browser extensions.

By joining now, you:

• Get early access to internal features and CLI updates
• Join the private Founding Members discussions
• Receive a special badge on the website and docs
• Are permanently remembered as part of the foundation

There are only 1,000 Founding Member spots available. Once filled, the opportunity to join this group will close.

Sponsor Deliverables

Your sponsorship helps validate the belief that simplifying cross-browser extension development is a shared need among developers, users, and browser extension enthusiasts.

Thanks for considering Extension.js,
Cezar