extension.js

extension.js is a cross-browser extension framework designed for developers who want to build, test, and package browser extensions for Chrome, Firefox, Edge, and Safari from a single codebase. It simplifies the development workflow by providing a unified API, built-in TypeScript support, and automated build tools, eliminating the need for manual polyfills or separate configurations. This project is interesting because it dramatically reduces the friction of multi-browser extension development, making it accessible for both indie developers and teams targeting the widest possible audience.