DevTools Z-index is a subscription-based extension for Firefox designed specifically for web development. This tool focuses on enhancing the user's experience by providing a straightforward way to manage and visualize the z-index values of elements on a webpage. It simplifies the debugging process, allowing developers to easily identify and adjust the stacking order of elements without diving deep into CSS code.

This extension stands out for its user-friendly interface and efficient functionality, making it an essential tool for developers working on complex layouts. With DevTools Z-index, users can quickly manipulate z-index values and see real-time changes, significantly improving workflow efficiency. This application is ideal for both novice and experienced developers looking to enhance their web development capabilities.