Not sure why Firefox chose to build their own developer tool when firebug was one of the compelling reason to use firefox and started the trend of having an extensive tool for debugging/inspecting webpages.
I may be wrong ..
Originally firebug had to be really slow because of the interfaces available for debugging, the internal tool could work without slowing everything to a crawl.
With the newer debugging interface it seems like firebug can work and the browser can be fast.
Yeah, you are right. But i meant to say that firefox could have made firebug as its own developer tool and continue to make it better instead of building their own.
