I know you have posted everything seemingly from Windows, so this may not be the proper place to post this, but I will anyways... I use coda to dev websites (front and back ends) and I love firefox (mainly because of the inspect dom and highlighting of elements, and the realtime css changes you can make. My Point: I get the feeling a good Mac App developer could create a similarly operating application for building the html/css of a site, building it real time, with the ability to save it as you are making changes. Basically building a page in firefox but having it save to your filesystem with a few UI modifications.