Mozilla Firefox is becoming more and more powerful tool in these days. Using right add-ons it will start to become a tool, You can`t live without as web-developer! Each of these plugins can make certain things easier and that`s especially important for web-developers, because searching for errors and optimizing your pages can be pretty painful and time-consuming process. And that`s the reason, why I looked over 100+ pages, to get overview which add-ons are used and recommended by amateurs.1.Web developer`s toolbar Web Developer`s tool bar probably will become one of the best plugins You`ve ever seen. It comes with his own tool bar that gives many useful tools for analyzing, validating and optimizing web-pages. The great thing about this plugin is that it’s on a few different browsers, so if you switch between them you will be able to use the same plugin on all.