getfirebug.com has Firebug 1.9a5
Firebug 1.9a5 is compatible with Firefox 5 – Firefox 10 (nightly).
There is one bug in Firefox that prevents using Firebug’s debugger on Aurora. It’s already fixed in Firefox Nightly and currently being ported to Aurora.
Update: Fix for the bug has been ported to Aurora.
Firebug 1.9a5 fixes 6 issues.
There are no new features in this release. We have been mostly focused on stability and regression bugs.
We are planning to release 1.9 beta 1 soon so, any feedback is appreciated!
Please post feedback in the newsgroup, thanks
Jan ‘Honza’ Odvarko