Since the introduction more than two months ago, the Beta development milestone of Internet Explorer 9 has gained nearly 13 million downloads. Moreover, Internet Explore 9 takes the responsibility for the largest Beta testing program in the history of Microsoft.
On the other hand, Mozilla is seeking for more than 2 million testers for the Beta of the coming main version of its open source browser before Firefox 4.0 is shipped. Only two months ago, Internet Explore 9 had 13 million downloads. The first appearance of Internet Explorer 9 to the world at the professional Developers Conference 2009 marked the milestone when it was announced on November 17th, 2010. According to Microsoft’s Ziad Ismail, since the release of the beta, it has still been the fastest adopted browser until now. Dean Hachamovitch was General Manager of IE at that time, but not Corporate Vice President, Internet Explorer. IE9’s browsers is lagging, notably JavaScript speed which was reported by the WebKit SunSpider benchmark.
After the IE9 Beta was introduced in mid-September 2010, Two development milestones carried to adopters and developers soon. The Internet Explorer 9 Platform Preview 7 Build was moved to testers on November 17. Of course, now IE9 PP7 is the quickest browser in terms of JS in the world, the results of the SunSpider benchmark said.


