What is "firebug"

Firebug is a development tool web that facilitates the debugging, editing and monitoring of any website css, html, gift, xhr, and javascript; it also offers other web development tools. The Firebug Javascript panel can record errors, profile function calls, and allow the developer to run arbitrary Javascript. Your network dashboard can monitor browser Urls requests, such as external CSS, Javascript, and image files. The network panel can display request headers and response headers for each active page; it can also estimate the time it took each page to load.

Firebug is free and an open source project; it is licensed under the BSD license. Firebug was initially written in January 2006 by Joe Hewitt, one of the original creators of firefox. The Firebug Working Group oversees open source development and extension of Firebug. It has two major implementations: an extension (add-on) for Mozilla Firefox and a bookmarklet implementation called Firebug Lite. A version cross-browser is under development. Currently, Firebug add-on has more than 3 million active daily users.

In addition to web page debugging, Firebug is a useful tool for web security testing and web page performance analysis.