What is extention?

An extension is a software component that adds features to a web browser. Extensions allow users to customize their browser experience by adding new functionalities, modifying the appearance or behavior of websites, or improving the overall performance of the browser. Extensions are typically written in programming languages such as HTML, CSS, and JavaScript. They can be downloaded from browser-specific extension stores, such as the Chrome Web Store or Firefox Add-ons. Popular browser extensions include ad-blockers, password managers, and social media enhancers.