Why Create Extensions on Firefox?
Get your great idea into the hands of millions of Firefox users. Join an international community of developers. Be supported every step of the way. And, when you build for Firefox first, it’s easy to port your extension to other browsers, saving you valuable development time.
Cool Things Add-ons Can Do
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.
It's easy to create your cross-browser extension for Firefox. Where your development journey begins depends on your skill and experience.
Build secure extensions
Mozilla takes the safety and privacy of its users very seriously. Be sure to review and follow these practices and policies so you can make your great idea a reality.