Working on the mozilla source code....worst decision ever. They made chrome from scratch and its already got large number of users without any special feature.
Sure, but that was Google. If some random, unknown company made a browser just as good as Chrome, it wouldn't have gotten a tenth the users Chrome has now.
I would say Mozilla/Gecko was a very good choice when the project started. Webkit itself was just being open-sourced at the time and cross platform compatibility was lacking.
They're using the WebKit rendering engine. While Chrome is a great browser, I'd hardly say it was "made from scratch".