Add-on (Mozilla)
Software modules to extend Firefox web browsers / From Wikipedia, the free encyclopedia
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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.[1]
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.[2][3][4] Thus add-ons that remain compatible with Firefox are now largely compatible with Chrome as well.[5] As of January, 2024, there are more than 36,000 add-ons and over 495,000 themes available for Firefox.[6][7]