The other day, the headquarters of Mozilla sent out a message that the number of Firefox browser users had exceeded 500 million. This figure has doubled since the release of Firefox 3 a year ago. The current CEO, Mr. John Lilly, said that currently there has been a significant increase in the number of Firefox users in all countries and regions. He particularly pointed out that the number of Firefox users in China and Spain had increased significantly in 2009. So far, the number of Firefox users in China has tripled!