How to Build an AI Powered Chrome Extension with React & Plasmo (Auto Form Filler)

In this video, I show you how to build a browser extension from scratch using Plasmo, React, and a Python backend powered by FastAPI and PydanticAI. We’ll walk through the design, architecture, and full implementation of an Auto Form Filler extension. 🎯 What You'll Learn: How browser extensions work Plasmo fundamentals (popup, background, content scripts) React integration inside a Chrome extension Designing AI-powered agents with PydanticAI Setting up a FastAPI backend for extensions High-level architecture & messaging flow 💻 Resources: GitHub Repository: https://github.com/bjoxiah/auto-form-... Plasmo Documentation: https://docs.plasmo.com/ ⏱️ Timestamps: 0:00 - Introduction 0:32 - Extension Demo 3:07 - High-Level Architecture 7:46 - Code Overview 17:08 - Chrome Extension Configuration 17:49 - Outro Perfect for developers building browser extensions, AI tools, and React-powered automations. ⭐ If you found this helpful, check out the repo and subscribe for more AI & software engineering content! #browserextensions #reactjs #plasmo #fastapi #python #pydanticai #aitools #softwareengineering