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.

Features:

• 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.

Works with Firefox 6.* and above.

What´s New in version 1.9.2:

• Edit element style from computed style does nothing
• 'Enable JavaScript and Refresh' doesn't work
• 'Break On This Error' missing from the context menu
• Half-rendered panel shown off-place when clicking magnifier in search field
• Ctrl-0 zoom requests are intercepted by Firebug
• HTML panel doesn't get updated, if nodes are changed at another panel
• Display of Style side panel fails for invalid character in string
• domplate issue with BR() in it
• FF nightly (Apr-05) broke DOM inspector
• Further avoidance of Ci.nsIScriptError2