Can you provide more context? This post has no information. What is the correlation between an Android game here and the Firefox browser?

Are you talking about the Leethax Firefox extension ? If yes, once you've installed the plugin all the cheats will be activated automatically (Infinite lives and boosts,All unlocked charms are bought)- if it does not works anymore, probably the cheat has been patched or you are experiencing issues with the extension. But you should take care though with Add-ons that are not in the marketplace. Also, cheating is sort of bad, but it's up to you anyway.