An extension's components will depend on its functionality and may not require every option. Extension components are created with web development technologies: HTML, CSS, and JavaScript. Components can include background scripts, content scripts, an options page, UI elements and various logic files. Now that Manifest V3 has launched, we strongly recommend that you use it for any new extensions that you create.Įxtensions are made of different, but cohesive, components. The page you're viewing describes extensions using Manifest V2.