Nearly a third of the worldwide web browser market appears to be using Mozilla's Firefox.

That's what Mozilla figured out after crunching numbers from a variety of firms — StatCounter, Quantcast, Net Applications and Gemius — and mixing in its own data. The open source browser's largest market share is in Europe, with nearly 40 percent penetration (152.7 million users). The company rather cheerily pointed out that wasn't even the browser's largest market penetration. In Antarctica, StatCounter gives Mozilla 80 percent of the market.
Full view here:Firefox: 30 percent of the world market | NetworkWorld.com Community