Offline Caching is a Firefox add-on designed for web developers and IT professionals, enabling offline access to any website or application. This tool injects a dedicated Service Worker into chosen hosts, allowing users to utilize web resources without an active internet connection. It leverages established web technology for reliable performance, making it a valuable addition for those needing consistent access to web applications.

This add-on is particularly useful for websites that do not natively support offline functionality. However, it is important to note that Offline Caching operates only on HTTPS sites and is not compatible with private browsing modes. As a free tool within the Development & IT category, it provides a simple yet effective solution for enhancing the usability of web applications in offline scenarios.