With literally hundreds of free Firefox extensions available on the Web, it"s hard to sort through the ones that can really tailor to your needs. ExtremeTech has compiled a list of their favorite Firefox add-ons and chunked them down into four categories: Web development, better browsing, media, and information/reference. Even for users who only browse the Web, there are plenty of add-ons to improve the experience, such as link previewing, customizing Google, and many more.