Single-spa Inspector is a Firefox extension designed for developers working with single-spa applications. It facilitates visualization by displaying all registered applications, allowing users to manage their states effectively. Users can force mount and unmount applications, providing a hands-on approach to debugging and testing. This tool is particularly beneficial for those using single-spa version 4.1 or higher, ensuring compatibility and optimal performance.

The extension is subscription-based and falls under the Development & IT category, specifically tailored for web development. With its user-friendly interface and essential features, Single-spa Inspector enhances the development workflow by offering clear insights into application statuses. It is an invaluable resource for developers looking to streamline their single-spa application management.