FireBug 1.12.6 / 1.13 Alpha 9

Explore the far corners of the DOM by keyboard or mouse.
FireBug is a Firefox extension that allows you to explore the far corners of the DOM by keyboard or mouse.

All of the tools you need to poke, prod, and monitor your JavaScript, CSS, HTML and Ajax are brought together into one seamless experience, including a debugger, an error console, command line, and a variety of fun inspectors.

Main features:

  • JavaScript debugger for stepping through code one line at a time
  • Status bar icon shows you when there is an error in a web page
  • A console that shows errors from JavaScript and CSS
  • Log messages from JavaScript in your web page to the console (bye bye "alert debugging")
  • An JavaScript command line (no more "javascript:" in the URL bar)
  • Spy on XMLHttpRequest traffic
  • Inspect HTML source, computed style, events, layout and the DOM

last updated on:
February 13th, 2014, 4:45 GMT
developed by:
Joe Hewitt
license type:
MPL (Mozilla Public License) 
ROOT \ Internet \ Firefox Extensions


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user rating 23



8 Screenshots
FireBug - Command line and its auto-completion.FireBug - Console panel with an example error logs.FireBug - CSS panel with inline editor.FireBug - DOM panel displays structure of the current page.FireBug - HTML panel shows markup of the current page.FireBug - Layout panel reveals layout of selected elements.FireBug - Net panel monitors HTTP communication.FireBug - Script panel allows to explore and debug JavaScript on the current page.
What's New in version 1.13 Alpha 9
  • Limit command history
  • Console grouping should be listed in the options of the Console Panel
  • Ctrl+Shift+C conflicts with Firefox DevTools' Inspector
  • Absolute Xpath
read full changelog

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