An extension is just a webpage, you have to include all of the client-side assets such as HTML, JS, CSS, images etc… and then the HTML file will load those files just like a webpage would, with the appropriate HTML elements.
An extension is just a webpage, you have to include all of the client-side assets such as HTML, JS, CSS, images etc… and then the HTML file will load those files just like a webpage would, with the appropriate HTML elements.