HeadingsMap is a Firefox extension designed for web developers and IT professionals, offering a comprehensive document map for any web page structured with headings. This tool generates an interactive index that allows users to navigate directly to different sections of a document by clicking on the headings. It also displays the HTML5 outline, helping users understand the document's structure at a glance. Additional features include a list of headings with their hierarchical levels, section details, and error notifications for structural issues, enhancing the overall usability of web documents.

With capabilities such as detecting changes in the DOM, manual content refreshing, and the option to collapse headers by levels, HeadingsMap is versatile for various use cases. It includes support for aria-labels, ensuring accessibility compliance, and allows users to copy links directly from the tree view. The extension also features two themes for user customization, making it a valuable tool for web developers, consultants, and auditors seeking to improve document navigation and structure.