Firefox is one of the popular free and opensource internet browser on worldwide web. If the report to be believed, It has estimated 20% to 24% of web usage share among all available browsers out there. The browser is especially popular among web developers because of its built-in tools, such as the Error Console or the DOM Inspector. It offers wide range of plugins that can be easily downloaded and integrated with the browser. Many of them are free of cost but some can be paid.