Feature Queries Manager (FQM) is a free Chrome add-on developed by iaderinokun. It falls under the category of Browsers and is specifically classified under Add-ons & Tools.

FQM is designed to help users manage and toggle CSS styles applied under a @supports Feature Query. With this tool, you can easily toggle CSS styles based on the support of certain features in the browser.

The program provides a user-friendly interface that allows you to enable or disable specific CSS styles applied within a @supports Feature Query. This makes it convenient to test and experiment with different styles based on the support of specific features in the browser.

Overall, Feature Queries Manager is a useful tool for web developers and designers who want to efficiently manage and toggle CSS styles based on the support of certain features in the browser. It simplifies the process of testing and optimizing styles for different browser capabilities.