With the third version, Firefox is gaining speed to claw at bigger and bigger user base! Firefox is running second behind Internet Explorer with almost 19% (by 20/06/08) of browser users in the world.. making Microsoft uncomfortable, since no other browser came this close! Fear of to be caught forced Microsoft to upgrade IE6 after 5 years! Over 8 million users have downloaded it within 24 hours!
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If you are not already a Firefox user, consider it now and learn from Wikipedia a bit more.