Effortless Good is a fantastic idea and great extension. Simply, Amazon runs an affiliate system which gives webmasters a fee for every purchase they refer. Effortless Good is a Firefox extension adds a referral code to when you visit Amazon so that the referral fee is collected and then split between four causes: the Rainforest Alliance, Save the Children, Grameen Foundation and the Participatory Culture Foundation. A fantastic idea and some great causes too (although I’m not too sure about the last one)