Browser Extension Dev

Build powerful plugins for Chrome and Firefox. Master Manifest v3, content scripts, popup UIs, and persistent background service workers.

Browser extensions can modify web pages, block ads, and automate workflows. This course covers the modern Manifest V3 standard required by the Chrome Web Store. You will learn to inject Content Scripts to manipulate the DOM of visited pages, use Service Workers for background tasks, and design Popup UIs using standard HTML/CSS. We also cover the Storage API for saving user settings and cross-browser compatibility to deploy on Firefox and Edge simultaneously.

✅ 100% Free & Lifetime Access

⏱️ 5-Minute Lessons (Bite-sized learning)

🚀 21-Lesson Path (Independent modules)

📱 Mobile Friendly (Learn anywhere)

Extension Devs

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Secure Enrollment via SSL

Complete Course Syllabus

1

Manifest V3

Structure, permissions, and security requirements.
2

Content Scripts

Reading and changing the content of websites.
3

Popup & Options

Creating UI for user interaction and settings.
4

Background Workers

Handling events when the popup is closed.
5

Publishing

Packaging, signing, and store submission process.

Estimated completion time: 21 lessons • Self-paced learning • Lifetime access

Career Outlook

Estimated Salary

$90k - $130k

Career Paths

Extension Developer $90k-$130k

Tools Engineer $100k-$145k

Freelance Developer $60k-$120k

What You Will Learn

Build cross-browser extensions using Manifest V3 standards

Inject Content Scripts to manipulate DOM on any website

Manage persistent state using the Extension Storage API

Handle background events with Service Workers

Publish extensions to Chrome Web Store and Mozilla Add-ons

Skills You Will Gain

JavaScript Manifest V3 DOM Manipulation Service Workers Web APIs

Who Is This For

JavaScript Developers

Tool Builders

Indie Hackers

Prerequisites

Intermediate JavaScript

DOM API Knowledge