FireBug

2.0.13 Web debugging extension for Windows

Fernando Ortega

Browser extension to analyze web pages with tools for inspecting and modifying HTML, CSS and JavaScript.

Free and open source Javascript debugging software download, reviewed by Fernando Ortega
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A free browser extension for monitoring and editing web page elements.

Firebug is a program that can inspect HTML elements on a web page and modify elements on-the-fly.

The interface of this addon includes a console, HTML output, CSS, Script, DOM, Net and Cookies.

Apart from the main inspection tool, Firebug is definitely a very valuable tool for people building web sites and online services because it includes a whole suite of tools for debugging and checking elements of a page.

With Firebug, you can easily check JavaScript errors and warnings, check network resources and the speed of elements loading and also change the styles of CSS elements.

The Cookies tab provides very detailed information about the cookies which a web site is serving to its visitors while the HTML and CSS tabs provide a full, editable output of HTML and CSS code that is being served and used to built a page.

Overall, Firebug is a very useful tool for editing and debugging web pages in Firefox and has become really the gold standard among web developers.

Features of FireBug

  • Accessibility: Accessible menus and UI.
  • Customization: Extensive customization options.
  • DOM Exploration: Live editing, viewing and traversing.
  • Debugging: Step through JavaScript, pause code execution, inspect and edit HTML and CSS.
  • JavaScript: Logging, breakpoints, command line and monitoring.
  • Network: See HTTP headers, timing info and post data.
  • Profiling: Monitor CSS selectors, JavaScript functions and XMLHttpRequests.
  • UI: Keyboard shortcuts, searchable options and status bar integration.

Compatibility and License

FireBug has been released under a BSD license on the Windows operating system from Firefox addons. This means you can download, install, run and share this program freely without any restrictions. Unlike GPL software, the source code isn't necessarily available.

What version of Windows can FireBug run on?

FireBug can be used on a computer running Windows 11 or Windows 10. Previous versions of the OS shouldn't be a problem with Windows 8 and Windows 7 having been tested. It runs on both 32-bit and 64-bit systems with no dedicated 64-bit download provided.

Other operating systems: The latest FireBug version from 2024 is also available for Mac.

Filed under:
  1. FireBug Download
  2. Free Firefox Addons
  3. Open source and GPL software
  4. Javascript Debugging Software
FireBug has been picked by our editors as very good.
FireBug has been tested for viruses and malware.
We have tested FireBug 2.0.13 against malware with several different programs. We certify that this program is clean of viruses, malware and trojans.