Superbox Unlocker is a Chrome extension designed to unlock APN settings on certain Huawei B535 superbox routers. Some of these routers come with locked functionalities, specifically APN dial-up settings, which can limit the use of different SIM cards. This extension aims to unlock these restrictions and enable users to customize their APN profiles.

The key features of the Superbox Unlocker extension include unlocking the "plus" button to add new APN profiles and enabling the "save" button during APN profile creation. This allows users to save new profiles and make edits as needed, providing greater flexibility in configuring their router settings.