WebSocket Weasel is a subscription-based tool designed for web developers, running on Firefox. This application focuses on enhancing the WebSocket communication process by providing a range of features that facilitate efficient local development. Key functionalities include support for binary communication, sub-protocols, and a syntax highlighting feature for JSON. Additionally, it offers an eye-friendly interface with both light and dark themes, ensuring comfort during prolonged usage.

The tool is dependency-free and works offline, making it suitable for local development scenarios. Notable features include memory slot management that allows users to save and quickly access frequently used messages, a sent message history, and various keyboard shortcuts for streamlined operations. Recent updates have improved binary support and introduced a more user-friendly interface, enhancing the overall user experience while working with WebSockets.