One of my must have extensions for firefox has a new version out! Firebug, if you don’t already know, is an Ajax/layout/javascript troubleshooter and is extremely well developed. In version 0.4, Firebug steps beyond the bounds of being a troubleshooter and can now be considered a full fledged debugger. Its new features include:
- JavaScript Debugger
- Stack Traces with JavaScript Errors
- Debug JavaScript Errors
- Logging levels and assertions
- printf-like String formatting
For more info, check out the release notes!
(note: I found out about this on Ajaxian)