You'd be lying if you said you'd never tried FarmVille. Well, theoretically you could claim to be one of the few that has yet to try FarmVille, but with over 80 million users you're probably lying.
True, most of those 80 million are middle-aged housewives that think an 'extension' is a way of increasing the range of the vacuum cleaner, but by my reckoning there must be some Download Squad readers that also play FarmVille. This post's for you, power users; power farmers. Why calculate your crop harvests in your head when a userscript can do it for you?! Or, indeed, why should you spend time adopting animals and accepting bonuses when there are peas and asparagus to plant?
Remember, Chrome 4 and above supports Userscripts -- though where Chrome Extension versions exist, I have included a link. Firefox users will have to install Greasemonkey.