However, respect server rules. On public competitive servers, leave the mod in your desktop folder. On your private world? Light up those deep dark caves without fear of the Warden (though the Warden still hears you—Fullbright doesn't fix that).
This file is a designed for the Fabric mod loader, specifically compatible with version 1.21.4 . Purpose and Functionality File name- Fullbright-Mod-Fabric-1.21.4.jar
Since the file is named Fabric-1.21.4 , you must have Fabric installed. However, respect server rules