postMessage-tracker-f is a Firefox extension designed for web developers that enables monitoring of postMessage listeners in real-time. This tool highlights potentially vulnerable functions and tracks listeners across all subframes, allowing developers to identify both persistent and short-lived listeners effectively. It provides a comprehensive logging feature that helps in reviewing listener functions and their locations at a later stage, enhancing the debugging process for web applications.

This extension is particularly useful for tracking inter-window communication, making it easier to analyze interactions between different windows. It supports various wrappers like Raven, New Relic, and jQuery, unpacking them to reveal the underlying listeners. The extension offers options to log detailed listener information to a specified URL, improving the overall development workflow by facilitating thorough inspection of listener behavior.