The CSS Stacking Context Inspector is a Firefox extension designed for web developers. It enhances the developer tools by adding a dedicated panel and a sidebar within the inspector. This tool provides valuable insights into stacking contexts associated with the currently selected Node, allowing developers to visualize and manage the layering of elements on a webpage more effectively.

With its intuitive tree-like view, the stacking context panel displays all available stacking contexts on the current page, facilitating better understanding and debugging of CSS layering issues. This subscription-based tool is particularly useful for those focused on web development, offering a streamlined approach to managing complex visual hierarchies in web applications.