Question

what can you add to your browser to enhance it with new functionalities and features?
browser themes
browser cache
browser extensions
browser settings

Explanation:

Browser extensions are small software programs that can be added to a web browser to enhance its functionality. They can provide additional features such as ad - blocking, password management, and translation services. Browser themes only change the appearance of the browser, browser cache is used for storing web page data to speed up loading, and browser settings are for configuring the browser's basic behavior.

Answer:

Browser extensions