“Every month, a committee of Firefox volunteers — who really, REALLY love Firefox Add-ons  — puts their time and effort into finding the best new add-ons. These add-ons are the little pieces of software that add functionality to your Firefox browser and help you customize Firefox to meet your needs and tastes. Can you see why these volunteers like them so much? …” Source: Mozilla | The Den Details  Best Firefox Add-ons of 2013