A comprehensive, step-by-step guide on integrating Firebase Authentication with Next.js using the zero-bundle size `next-firebase-auth-edge` library. It includes steps for user registration, login, and logout functionalities, along with redirect logic for a seamless user experience. In this guide, you're going to learn how to integrate Firebase Authentication with the latest Next.js features, such as App Router, Middleware, and Server Components. It concludes with instructions on deploying the app to Vercel, showcasing the library's ease of use and future-proof design for developers looking to enhance their Next.js applications with Firebase Authentication.