Master Manifest V3 Extension Development

A practical cross-browser resource for building, testing, and publishing modern browser extensions.

Explore Core APIs Learn Architecture

Three Pillars of MV3

Pick your track and jump straight into production-ready MV3 documentation.

Core APIs & Data MV3 Architecture UI/UX Patterns

Why MV3?

⚡

High Performance

Event-driven service workers with instant startup and efficient resource usage

🔒

Enhanced Security

Strict CSP policies and context isolation prevent malicious code injection

🌍

Cross-Browser

Modern API standards work across Chrome, Firefox, Safari, and Edge

📱

User Privacy

Declarative rules and transparent permissions put users in control

Get Started

For Developers

Learn core extension APIs, messaging patterns, and architectural best practices.

Start with Service Workers

For Designers

Master UI/UX patterns for responsive popups, options pages, and interactive components.

Explore UI Patterns