Firefox 4 vs. IE9

{Before you read the reviews, I have no personal experience with the new browser updates.  I have no intentions of ever updating my Internet explorer as I never use it.}  FireFox 4 beat IE9 in first day downloads this week.  Last week when Microsoft unveiled Internet Explorer 9, the company announced that the new browser was downloaded 2.35 million times.  Now that might seem like a lot but in FireFox 4's first 24 hours, Mozilla has reported that the new open-source browser was downloaded 7.1 million times.  Unfortunately for Mozilla, that is less than FireFox 3 had in its first 24 hours.  When Mozilla unveiled FireFox 3 in 2008, it was downloaded 8 million times.
You can find more information on the browser wars at http://www.informationweek.com/news/internet/browsers/showArticle.jhtml?articleID=229400258&cid=RSSfeed_IWK_All
{Even with the new updates, I am not persuaded to move from Google's Chrome browser as my main browser.  Although I am interested in looking at the new FireFox 4 just to see what it is like.}