Might it be that there are too many bars at the top of your browser window?
Visible bookmarks bar, search bar, and tab bar is basically default behavior for FF. The rest is FF chrome. Also, most people don't run their browser maximized to full screen. So in answer, no.
Web sites must adapt and be accepting of user behavior and their computing environment. A web site that forces people to change their behavior stands a good chance of loosing visitors.