Why this matters: Firefox has always been the favorite of users who support a wide variety of flexibility via plugins. With Microsoft's plugin-friendly Spartan browser waiting in the wings, it's really not the best time to jump ship. Nightingale's departure may not be a Sign of Doom. But if the market share numbers don't reverse course, Firefox could wander into the Opera and Safari hinterlands and lose itself completely within a couple of years.
Story updated at 9:50 AM on Feb. 19 to add Nightingale's replacement.
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