У вашего броузера проблема в совместимости с HTML5
In this tutorial I go over the different ways of storing data using the Custom NPCs mod and how to share data between functions.
DateKeeper Init Function: https://github.com/OsimonB/CustomNPCs/blob/master/Ep2_StoringData/DateKeeper_Init.js
DateKeeper Update Function:https://github.com/OsimonB/CustomNPCs/blob/master/Ep2_StoringData/DateKeeper_Update.js
Custom NPCs Mod: http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1278956-custom-npcs
Song: Lost Frontier - Kevin MacLeod