The Immutable.js Devtools extension enhances the readability of Immutable JS objects in Chrome's Dev Tools. This free add-on addresses the common challenge of inspecting immutable collections, which typically display only their internal data structure rather than their logical contents. With this tool, developers can easily view the items within Immutable Lists, Maps, and other collections directly in the console, improving the debugging experience.

Compatible with Chrome (version 47 and above) and Firefox (version 116 and above), this extension leverages custom formatters to transform how values are shown in the browser's Dev Tools. By implementing these formatters, the extension allows for a clearer representation of data structures, making it easier for developers to understand and work with their Immutable.js collections.