From the data of StatCounter, established by the community coordinator for Mozilla, Firefox 4 is right in front, reaching almost 14% of market adoption. Meanwhile, Internet Explorer 9 is just over 4% interest.
Comparative use of FF4 and IE9. (Source: StatCounter)
The advantage of Mozilla is on the capillarity of its software. Firefox 4 runs on both Mac and Windows. In Microsoft System Works on Windows XP, Windows Vista and Windows 7. Meanwhile, the IE9 was only released for Windows Vista and Windows 7 (though certainly not Mac).
the adoption of FF4 grew even more when he was included in Firefox Update when a new version of Firefox is offered to all users of older versions. There was no similar spike when Windows Update began offering IE9.
"Today and for the foreseeable future, Microsoft is number three in terms of usage among modern browsers, "wrote the coordinator. Actually, MS is facing strong competition from Mozilla and Google with its Chrome. It is noticeable in the statistics of TB that Chrome appears first, as most used browser, followed closely by Firefox.
