Microsoft Corp.'s share of the U.S. browser market has slipped below 90 percent as the Firefox browser continues to grow in popularity, according to independent tracking by WebSideStory.
Firefox, an open-source browser collectively developed by the Internet community under the Mozilla Foundation, had a 6.8 percent share as of April 29, an increase from 3.0 percent since WebSideStory began tracking Firefox separately in October.
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