Your First 'Hello World' Extension
Create a minimal 'Hello World' extension, covering the manifest file, basic structure, and loading into the browser.
Your First Extension: Hello World
Time to build your first extension — a classic Hello World popup that greets you when you click its toolbar icon. The core Manifest V3 shape.
Core Extension Components
Every extension needs a few key files: manifest.json (the blueprint), popup.html (the popup content), and an icon. We'll build them step by step.
All lessons in this course
- What are Browser Extensions?
- Setting Up Development Environment
- Your First 'Hello World' Extension
- Anatomy of an Extension Project