add-on

Add-on is the Mozilla term for software modules that can be added to the Firefox web browser and related applications. Mozilla hosts them on its official add-on website.Browser extensions are the primary type of add-on. In 2017, Mozilla enacted major changes to the application programming interface (API) for extensions in Firefox, replacing the long-standing XUL and XPCOM APIs with the WebExtensions API that is modeled after Google Chrome's API. Thus add-ons that remain compatible with Firefox are now largely compatible with Chrome as well. As of December, 2022, there are close to 30,000 add-ons and over 480,000 themes available for Firefox.

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