I disagree. The browser is a window to the internet, a container to let me view the website. I don't want distracting... 99% of the time I only use one button and one text field so why show me stuff I hardly ever use? In fact for non-techy users, all that stuff is just confusing.
Plus, in Chrome you can stick loads of extra stuff under the tab bar if you so desire. So I'm certain you can do to even greater levels in FF.