I prefer it as well, but installing it on a new system the other day reminded me how much I end up having to tweak the UI to something I like.
Ad Block Plus, obviously. Then Tab Mix Plus, since I like my tabs at the bottom. Then classic them restorer, since I prefer navigation buttons on the left (backward, forward, new tab, stop and reload buttons).
Also, setting flash (and now that I look, most of the media plug ins) to "always ask", eliminating auto play horseshit on websites.
All of that doesn't take long, but when I only do it every few years, I end up stumbling through 3 million settings, trying to remember what I set where.