A funny thing to happened to Firefox on the way to vanquishing Internet Explorer: the Mozilla browser's success opened the door for a host of its other competitors.

Even as Internet Explorer's market share has slipped--down a dramatic 8 percentage points to 65.5 percent in about the last year--Firefox programmers face a surprising question: should they be more worried about the programmers in Redmond, Wash., or about those working on Apple's Safari, Google's Chrome, and Opera?



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