According to John Lilly, the Firefox web browser has 126 million unique monthly users. A figure extrapolated from an Active Daily Users number of 48 million, itself a massive increase on the 23 million ADU figure from this time last year. So who is John Lilly and why should we take any notice of his figures? Well, Lilly happens to be the Chief Operating Officer at Mozilla and the figures have been reached by analysing statistical data from the Firefox browser update service logs.