Firefox has already more than 1200 extensions. Which ones are useful? After indulging in installing few hundred of them, I choose the 27 best, based on how much I use them every day. I've been impressed by many, but these 27 are the ones I use daily. The order is alphabetical. 1. AI Roboform Toolbar : http://www.roboform.com/ When you register to the 101th site and you get your Nth username and p