ECMA Visualizer is a free Chrome extension designed to enhance the understanding of the ECMAScript language specification, specifically ECMA-262. It provides users with example programs that illustrate various parts of the specification, allowing for a more intuitive grasp of JavaScript concepts. The tool is based on research from a published paper, ensuring a solid foundation in its educational approach.

In addition to its example programs, ECMA Visualizer includes a debugging feature called resume. This functionality enables users to begin debugging from a specific position within the selected step of the specification. This adds a practical dimension to learning, as users can see how theoretical concepts apply in real-time debugging scenarios.