À l'OSCON de Portland (Oregon), selon Source Forge, Mike Schroepfer, directeur de l'ingénierie de Mozilla, a estimé la part de marché de Firefox :

One interesting statistic given by Schroepfer, if accurate, is the estimate of Firefox's current market share. According to Schroepfer, Firefox has a 14% market share at this point, with about 60 million active users.