It has its license under the BSD license and was initially written in January 2006 by Joe Hewitt, one of the original Firefox creators. The Fire bug Working Group oversees the open source development and extension of Firebug. It has two major implementations: an extension for Mozilla Firefox and a bookmarked implementation called Firebug Lite which we can use with Google Chrome.
In addition to debugging web pages, it is a useful tool for web security testing and web page performance analysis.
It makes changes immediately and gives constant feedback to the user. All editors in Firebug support auto complete.
HTML and CSS
The HTML and CSS tools allow for the inspection and editing of HTML and CSS elements on a web page. Later versions of allow users to see live changes to the CSS. Visualization of CSS elements is shown while inspecting HTML elements. The Firebug layout tab display and manipulate CSS property values. Furthermore, users can click on any visible HTML elements on a web page to access its CSS property values.
Many extensions have been made to enhance the Firebug experience. Since Firebug is open source, users can contribute their own extensions to the Firebug community.