I'm pretty sure these stats are still wrong. When it was last reported that Chrome had beaten out Firefox, that was wrong too and as far as I'm aware Firefox is still slightly ahead. Ars Technia run a monthly article that explained this
What happens is that Chrome preloads the pages of the links on a page that you are in, in such a way that stat counters count it as 'loaded' so when you have statistics based purely on usage figures rather than ownership, Chromes score is inflated quite a bit.
What happens is that Chrome preloads the pages of the links on a page that you are in, in such a way that stat counters count it as 'loaded' so when you have statistics based purely on usage figures rather than ownership, Chromes score is inflated quite a bit.