Debug, modify, and monitor CSS, XML Http Requests, HTML, and JavaScript.
Firebug is a Firefox extension that puts a wealth of Web development tools at your fingertips while you browse. You can edit, debug, profile and monitor CSS, HTML, XMLHttpRequests and JavaScript in any Web page in real time.
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Stay organized online.
Evaluate web pages and report on why they're slow.
Take a full page screenshot of your current browser window.
Add menus and a toolbars with various web developer tools to Firefox.
Replace your blank tabs in Firefox with thumbnails of your favorite sites.