I merged menubar and toolbar a few years ago: <a href="http://akkartik.name/akkartik.firefox.png" rel="nofollow">http://akkartik.name/akkartik.firefox.png</a>
(via <a href="http://akkartik.name/firefox.html" rel="nofollow">http://akkartik.name/firefox.html</a>)<p>I remember I spent a long time changing the tooltip on the throbber. Every new version I'd open up one of the jar files to update the tooltip. By the time of this screenshot I had gotten rid of the throbber altogether.