Some interesting quotes from the article:

FIREFOX is a classic overnight success, many years in the making.

Firefox is a Web browser that is fast and filled with features that Microsoft's stodgy Internet Explorer lacks.

For the first time, Internet Explorer has been losing market share.

Today, it's the Internet Explorer code that is long overdue for a top-to-bottom redesign, one that would treat security as integral, and Firefox is the challenger with new, clean code.

Source: The Fox Is in Microsoft's Henhouse (and Salivating)