Xposer is a Chrome extension that utilizes the Xposer.io API to provide users with detailed information about the product and version of a website they are currently browsing. By simply clicking the extension icon and selecting 'Expose', users can reveal the exact version of content management systems such as WordPress, Drupal, Joomla, TYPO3, and Concrete 5. This tool is particularly useful for developers and site owners who want to ensure their websites are running the latest versions of these products.

With Xposer, developers can identify opportunities to offer upgrades to website owners based on the revealed version information. Site owners can also leverage this tool to verify whether they are using the most current version of their website's product, enhancing security and performance. The extension is free and aims to expand its list of supported products and features in the future.