Peter is correct that most of the browser interface isn't too far out from style guide anyway. I use netsurf at home and firefox on windows at work. Most of the interaction is clicking on the web page or the buttons in the toolbar. The biggest difference I find is using the "menu" button on windows and chosing new window rather than adjust on firefox. Obviously there are lots of other differences, but they are all things used far less often. Certainly not horrible enough to not want the browser if it's like that. Anyway, isn't the plan that the underlying libraries will be improved as time goes on to be get closer to the style guide?