The company saw the number of Firefox users inch tantalizingly close to the 10 percent figure (9.57 percent, to be exact) in December 2005, a nearly 1 percent jump from November 2005.
Microsoft's Internet Explorer (IE) still dominates the browser world at roughly 85 percent of the market. But that figure is a drop from NetApplication's November 2005 statistics, which put IE at 86 percent of the market.
Mac-based Safari inched up from 2.78 percent in November 2005 to 3.07 percent the next month; Opera experienced a negligible gain from .53 percent to .55 percent in the same time frame. Netscape dropped from 1.25 percent of the market to 1.24. All other browsers collectively saw a gain from .43 percent to .53 percent.
The numbers show that, while there are a number of browsers available today for end users, it's likely going to come down to a two-horse race between IE and Firefox.
"Firefox is very close to hitting a critical mass of 10 percent, which could mean a more rapid adoption rate," Vince Vizzaccaro, NetApplications executive vice president of marketing and strategic relationships, said in a statement.
Although Microsoft is by no means in danger of losing its browser crown for the foreseeable future, the software giant has indirectly acknowledged the rise of these alternative browsers by resurrecting its nearly dormant IE development team.
Last year the company started work on an updated IE with a projected release date in 2006. For many users, it can't come too soon; while advances in Web development continued apace, the last major update to IE was version 6 in 2001.
Microsoft officials won't comment on a timeline for IE 7 availability, but it does expect Web surfers will stick with IE 7 and continue its large presence in the browsing community.