Firebug 1.3 released
Firebug 1.3.0 is available to download from addons.mozilla.org. FireBug 1.3.0 is compatible with Firefox 3.0, with Firefox 3.0.5 recommended. It is not compatible with the in-development Firefox 3.1 though. Firebug 1.4 will support Firefox 3.1, but is only in alpha at the moment, with a beta promised soon. Details of the new versions are on getfirebug.com's releases page. Firebug is available under a BSD licence.