> We thought long and hard about including Firebug wholesale and considered several approaches to integrating it. An early prototype of the Inspector even included a significant portion of Firebug. Ultimately, integration proved to be too challenging and would have required rewrites that would have been equivalent to starting over.
I suppose, in the near future, some redundant features will be cut from Firebug.
Regarding Fx dev tools, they e.g. do not show evaled scripts at all in the JS panel. Also I don't see a way (yet) to have debugger and console visible at the same time. And there are many other tiny Firebug goodies not implemented yet here and there. Firebug will be still essential for me for many months.
I hope Firefox Dev tools clone the best parts of Firebug and Chrome Tool.