Firefox had more than 30% market share at their peak, against pre-installed IE and Microsoft aggressive tactics. It was before the ballot screen. Together with

Firefox had more than 30% market share at their peak, against pre-installed IE and Microsoft aggressive tactics. It was before the ballot screen. Together with Chrome, they ended up beating IE, at the time neither had a significant advantage in distribution, at least compared to IE. So in theory, Chrome can be beaten, except that unlike IE, Chrome doesn't suck, in fact, about the only thing going for Firefox is that it is not Chrome.