Working at Mozilla Corporation since 2005 and as chief executive since early 2008, he helped oversee a remarkable achievement. Mozilla has built the Firefox browser from a largely unsuccessful remnant of the Netscape era of the 1990s into the browser that nearly a quarter of people on the Web use. Now the challenges are different.

First, for new growth, Mozilla must make its open-source browser appeal to an even more mainstream crowd, one that's more interested in working and playing online than in sticking it to Microsoft or being part of a cause. Second, it's got to keep the loyalty of the technically savvy early adopters and Web developers that Google now has been courting with its Chrome browser...

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