Hello there! I'm Cezar, browser extension developer and open-source maintainer.

I’m building Extension.js, the zero-config developer tool for creating, running, and building cross-browser extensions, and its upcoming companion platform, Extension.dev, for deploying, previewing, and publishing them.

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. Extension.dev will take those builds and power previews, deployment channels, and store automation.

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-source, improve docs, ship better templates, and build the bridge to Extension.dev, giving developers a complete, end-to-end way to build and ship extensions that scale.

Founding Members

Founding Members are the first 1,000 sponsors who believe in the mission of making browser extension development easy, fast, and reliable across all major browsers. These vanguardists play a fundamental role in shaping the tools, workflows, and platform features that will 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
• Secure early access to Extension.dev when it launches

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

Sponsor Deliverables

Your sponsorship validates the belief that simplifying cross-browser extension development, from first command to store publication, is a shared need among developers, users, and browser extension enthusiasts.