To remove an unwanted add-on or extension from a web browser, you typically access the browser's settings or options menu, navigate to the extensions or add-ons section, and then select the remove or uninstall option for the specific item you want to get rid of. This process may vary slightly depending on the browser, but the essential steps are similar across most browsers. It is important to understand how to remove extensions because they can affect browser performance and security. Other options, like disabling firewall or clearing browsing history, do not relate to managing browser extensions.