Extension showDomTree is a free Chrome add-on developed by pons.olivier. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. The main purpose of this extension is to draw or print the current DOM tree using a JavaScript version of Graphviz tools.

The extension is primarily designed for teaching purposes, allowing users to visualize the structure of the DOM tree. It provides a convenient way to understand the hierarchy and relationships between HTML elements on a webpage. However, it's important to note that the extension may not be suitable for large graphs or trees as Graphviz tools have limitations in handling such cases.

With Extension showDomTree, users can easily gain insights into the structure of the DOM tree, making it a valuable tool for web developers and educators alike.