Firebug are no supported by Yahoo
Job Announcement: The YUI Team Is Hiring an Engineer To Work on Firebug » Yahoo! User Interface Blog and there is a Google group
Firebug | Google Groups where you can discuss the plugin.
It is not so difficult to make your own FireBug extension.
Here are some relevant links in increasing order of difficulty:
- Software is hard | Extending Firebug, Hello World! (Part I.)
- Software is hard | Extending Firebug, toolbar (Part II.)
- FirePHP - Extending Firebug < Reference
You should watch the FireBug group and blog (
Firebug - Web Development Evolved) to stay up to date.
Note:
The
Gecko engine behind Firefox is designed to allow you to build user interfaces using an XML-based language called
XUL.