Bring your extension to life

Get how-tos, resources, and information to successfully build and ship your extension for Firefox.

Mozilla Developer Network

Documentation for the WebExtensions API can be found on the Mozilla Developer Network (MDN).

On MDN, you’ll find:

  • Tutorials to help you start
  • Explanations of key extension development concepts
  • A guide to extension UI components
  • How to use the extension Javascript APIs.
  • A reference guide for the extension Javascript APIs, including compatibility tables for other popular browsers.
  • A reference guide for the manifest.json file and its keys.