FireBug 1.3.3 / 1.4.0 Beta 7

Major Features:

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

Enhancements:

• Fixes for issue 1963, undefined objects in console and DOM panels,
• Issue 1968, on for all pages, but minimized,
• Issue 1970, Errors inside an XmlHttpRequest.onReadyStateChange fail silently,
• Fixed exceptions in Console and additional context-related problems around detached Firebug windows.

Requirements: Mozilla Firefox