Firefox, the open-source Web browser, holds nearly a quarter of the market. Now a mobile version called Fennec is coming. Like Firefox, Fennec allows developers--of which there are about 8,000--to add functions such as bookmark-synchronizing tools and video players. In addition, designers are trying to make navigation simpler; the "Awesome Bar," for example, drops down a list of recently visited sites or recently searched terms. Mozilla has already released a version for Nokia's N810 tablet computer; later this year it plans to roll out a version for Windows Mobile, as well as for phones that run the Symbian operating system.

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