Browser Extension Development
Free Intermediate course · 10 lessons · 3 weeks · Certificate on completion
Build Chrome and Firefox extensions with Manifest V3. Across 10 lessons you'll move from fundamentals to a portfolio-ready outcome — at your own pace, with quizzes after each lesson and a final exam to certify your mastery.
What you'll learn
- What extensions can do
- Manifest V3 structure
- Popups and options pages
- Content scripts
- Service workers in extensions
- Messaging
Skills you'll pick up
- What extensions can do
- Manifest V3 structure
- Popups and options pages
- Content scripts
- Service workers in extensions
- Messaging
Tools covered
- Browser Extensions
- Real-world projects
- Quizzes
- Final exam
Course modules
Module 1: What extensions can do
Module 1 of Browser Extension Development. 3 lessons · 3h
Module 2: Content scripts
Module 2 of Browser Extension Development. 3 lessons · 3h
Module 3: Storage
Module 3 of Browser Extension Development. 2 lessons · 2h
Module 4: Publishing to stores
Module 4 of Browser Extension Development. 2 lessons · 2h
Lessons in this course
- What extensions can do
- Manifest V3 structure
- Popups and options pages
- Content scripts
- Service workers in extensions
- Messaging
- Storage
- Permissions and privacy
- Publishing to stores
- Project: a reading-time extension
Instructor
Lena Fischer — Senior Frontend Engineer
Lena Fischer is a Senior Frontend Engineer with years of hands-on experience teaching Browser Extensions to thousands of learners worldwide.
Certificate
Finish every lesson and pass the final exam to earn a free, verifiable Learnera certificate for Browser Extension Development. It can be downloaded as a PDF and shared on LinkedIn.
Career outcomes
Median global salary $110,000 per year · median India salary ₹15,40,000 per year · 34,056 open roles worldwide
- Browser Extensions Specialist
- Senior Browser Extensions Lead
- Browser Extensions Consultant
Frequently asked questions
Is the Browser Extension Development course free?
Yes. Every Learnera course, including Browser Extension Development, is completely free — lessons, quizzes, the final exam, and the certificate.
How long does Browser Extension Development take?
10 lessons, typically completed in 3 weeks at a comfortable pace.
Do I get a certificate?
Yes — pass the final exam and you receive a free, verifiable certificate you can share on LinkedIn.