Firefox is an web browser maintained by the . It is the second most popular web browser today with millions of users. It is developed by a core team with contributions from hundreds of volunteer developers. Firefox is built to allow custom user configuration, and users can author extensions that can be integrated into the browser interface as seamlessly as the normal toolbar. Many web developers use Firefox as much more than a window to the but as an analysis and development tool our practices our production team develops and tests pages in the windows.