License / Price: Freeware
Version: 2.0.17
Language: English
Developer: Firebug working group
OS: Windows/Unix/Mac
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Firebug is an add-on for Firefox that provides access to browser internals. It features live editing of HTML and CSS, a DOM viewer, and a JavaScript debugger.

Web application security testers appreciate the ability to see what’s happening behind the scenes of the browser.

Firebug is a free and open-source web browser extension for Mozilla Firefox that facilitates the live debugging, editing, and monitoring of any website’s CSS, HTML, DOM, XHR, and JavaScript.

Firebug integrates with Firefox to put a wealth of web development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.


  • Inspect HTML and modify style and layout in real-time
  • Use the most advanced JavaScript debugger available for any browser
  • Accurately analyze network usage and performance
  • Extend Firebug and add features to make Firebug even more powerful
  • Get the information you need to get it done with Firebug
  • New features for Firebug users:
    • Performance Panel – The Performance tool gives you insight into your site’s general responsiveness, JavaScript and layout performance.
    • Memory Panel – The Memory tool lets you take a snapshot of the current tab’s memory heap.
    • Web Audio Editor, Shader Editor and Canvas – Developer Tools for debugging media-rich content on the web.
    • Storage Inspector – The Storage Inspector enables you to inspect various types of storage that a web page can use (cache, cookies, local & session storage, indexedDB).
    • Responsive Design Mode– Responsive Design Mode makes it easy to see how your website or web app will look on different screen sizes.
    • Animation Inspector – The Animation Inspector displays animations in the page synchronized along a timeline, with a draggable widget you can use to move to any point in the timeline and see the page at that point.
    • And more


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