Firebug and Yslow are two must have Firefox extensions for developers. As we are nearing Firefox 3 final release date i am hunting all the previous add-ons i used for Firefox 3 compatibility. Today i saw that Firebug people have released an updated version compatible with Firefox 3.
You can download the add-on from Mozilla site, the official Firebug site is currently offline.
Although Firebug is updated Yslow is not yet updated to Firefox 3 RC2, it is still at Firefox 3 beta 5, may be in the next few days we will get Yslow for Firefox 3 final version.