MHO Addon is a Firefox extension designed to enrich the MyHordes gaming experience by providing various helpful features. It enhances tooltips with detailed item information, including associated recipes, and updates external tools such as MyHordes Optimizer and Gest'Hordes. This add-on also includes a wiki for easy reference and a camping calculator to assist players in strategic planning.

Additionally, MHO Addon offers a shopping list feature that highlights essential items and provides search bars at various locations within the game. These features collectively aim to streamline gameplay, making it easier for players to access vital information and optimize their gaming strategies.