> Chrome borrowed their webdev tools from Webkit, who borrowed them from KHTML.

Neither KDE nor OS X ever shipped their built-in Web Inspector prior to the appearance of Firebug in 2006, and by that point WebKit and Safari were already in full swing. The very first iteration[1] of Web Inspector appeared around the same time as Firebug and was an original contribution by Apple; it wasn't borrowed from KHTML.

1. <https://web.archive.org/web/20070621162114/https://webkit.or...>