Why Create Extensions on Firefox?
Build on the web’s most customizable browser. Get your great idea into the hands of millions of users. Join an international community of developers in the movement to put people in control of their online lives. (P.S. There’s no cost to participate!)
Anatomy of an Extension
An extension is a simple collection of files that modify the browser’s appearance and behavior. It can add user interface elements, alter content, or perform background tasks that enhance browsing.
How to Build An Extension
Firefox extensions are made with the same technologies used to build the web. They employ a modern promise-based API to communicate with and customize the browser.
Build an Extension in Less Than 5 Minutes
Build Across Browsers
Firefox is at the forefront of cross-browser compatibility. Firefox extensions are built using the WebExtensions API, so your creation will be accessible to users no matter what browser they use.
Bring Your Extension to Firefox
Already have an extension that works in Chrome? Bring your app to Firefox in a few easy steps.
Tools to Build Faster
Attract Users with Content and Design
You’ll want users! The shortest route to getting, and keeping them, is creating a great experience and compelling product page.
What’s Great Content and Design?
Featuring Madhava Enros, Senior Director of Firefox User Experience, and Dietrich Ayala, extension developer.
Optimize Your Product Page
People spend just seconds on your product page. Make those seconds count with stellar content and visuals.
Focus on Usability
Build in UX best practices and the positive reviews and ratings will follow.
Connect with the Community
When you build on Firefox, you build with a community of extension developers. And they’re eager to share their expertise and answer your questions.