The graph the title links to is a little dated, it only cites stats up to July 2011. Here's a more up to date graph citing stats up to October 2011: http://gs.statcounter.com/#browser-ww-monthly-200809-201110 The curves are even more revealing.
In 5 years from now we'll probably start saying how "maybe its not a good thing for ANY company to have 90%+ market share in something as important as the browser" and how "Yeah well Google didn't play fair, but that' ok cause we hated MS, and no one cared much about brand-fanboism for Opera or Firefox"