What is My IP Address is a Firefox add-on designed for users who need a quick and easy way to view their public IP address. This lightweight tool features a simple toolbar popup interface that allows users to select from two types of servers—HTTP or STUN—to retrieve their IP address. The STUN servers utilize WebRTC technology, while the HTTP servers employ the fetch API for obtaining the IP address. The add-on ensures that all changes made in the UI are auto-saved, providing a seamless user experience.

The add-on operates without storing any personal data or interacting with third-party websites unless a server is selected. Users are advised to review the privacy policies of the selected third-party servers, as they may have different data handling practices. Overall, What is My IP Address provides a straightforward solution for anyone needing to check their IP address quickly and efficiently.