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Builder and SDK: Create Add-ons Quickly and Easily

Builder Overview
Builder Overview
 Builder Tutorial
Builder Tutorial

Add-on Builder and the Add-on SDK provide powerful APIs and tools that allow developers to create add-ons for Firefox using HTML, CSS and JavaScript. When your add-on is complete, we make it easy to share it with over 400 million Firefox users world wide.

Choose Your Build Environment

Add-on Builder

The Add-on Builder is a web-based development environment that provides additional functionality for working with the Add-on SDK.

  • Edit code in a feature-rich environment
  • Test your add-ons instantly
  • Use built-in version control & sharing
Try the Builder Now

Add-on SDK

The Add-on SDK is set of APIs bundled with a command line utility that allows you to develop add-ons with your own tool chain.

  • Choose your own code editor
  • Access your development files locally
  • Get greater control over SDK build steps
Download the Add-on SDK

There's Nothing to It

If you know HTML, CSS and JavaScript, you can make add-ons. With Builder, you don't even need to set up a build environment. Just log in and go.

Great Developer Features

All add-ons built with either tool are restartless by default. You also get access to a library of easy-to-implement APIs built by the Mozilla community.

Help is at Hand!

Need some support building your add-on? We have extensive documentation and a massive developer community to make sure you're never on your own.

Interested in making the Add-on SDK even better? Grab the source code, and find out how to help here.