What CMS Is This is a free Firefox extension designed for web development enthusiasts. This tool helps users identify the content management system (CMS) that a website is using, making it easier to understand the technology behind various sites. With a simple interface, it provides quick insights into the CMS, allowing developers and designers to make informed decisions about their own projects.

The extension is particularly useful for those involved in web development and IT, as it offers a straightforward approach to uncovering the underlying systems of different websites. By leveraging this tool, users can gain valuable knowledge about popular CMS options and their functionalities, fostering a deeper understanding of web technologies.