How to develop a Firefox extension – Mozilla Add-ons Community BlogUpdate: Firefox has used the WebExtensions API as its extension API since 2017. We encourage you to visit Extension Workshop to learn more about browser extensions and how you can build an extension for Firefox. You can find reference documentation for the WebExtensions API on MDN. Please do not reference this article for extension development, as it is out-of-date. If you are the developer of a l
