WhatRuns is a free browser extension for Firefox that allows users to identify the technologies used on any website instantly. With a simple click, this tool reveals a wealth of information about a site's underlying framework, including content management systems, analytics tools, and various web services. It is particularly useful for developers, marketers, and anyone interested in understanding the tech stack of their favorite websites.

The extension is designed for ease of use, integrating seamlessly into the Firefox interface. Users can quickly access detailed insights about any webpage, enhancing their web development and IT research capabilities. WhatRuns not only helps in identifying technologies but also keeps users updated on the latest trends in web development, making it an essential tool for professionals in the industry.