xhr-devtool is a free Chrome add-on developed by qianlfeg1st. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This handy tool allows users to replace response results.

With xhr-devtool, users can easily modify the response data of XMLHttpRequests in real-time. This can be particularly useful for developers who need to test different scenarios or simulate specific responses. The add-on provides a simple interface that allows users to input custom response data and replace the original results seamlessly.

By using xhr-devtool, developers can save time and effort by avoiding the need to modify server-side code or rely on external tools. It provides a convenient way to tweak responses directly within the browser, making the debugging and testing process more efficient.

Overall, xhr-devtool is a valuable tool for developers who work with XMLHttpRequests and need to manipulate response results. Its user-friendly interface and real-time modification capabilities make it a useful addition to any developer's toolkit.