Internet Explorer: The most widely used browser of the world. But losing its position day by day. Its active versions are IE 8, 9 and Beta Version 10. Few days ago Microsoft Officially stopped support for IE 6. Internet Explorer is losing its customers to Firefox and Google Chrome. But Microsoft is also working to increase the user of IE.
Google Chrome: The 2nd most used browser is Google Chrome. Now it is an active threat for Internet Explorer and Firefox. It has lots of extension available on chrome store. Its interface is very simple and nice. As a product of search giant Google it gets some extra advantages too.
Firefox: Competing hard with Internet Explorer and Google Chrome. With more than 5000 add ons Firefox are very popular to users. But the recent versions of Firefox are not stable enough. Mozilla Corporation is now releasing new version of Firefox very quickly.
Safari: The last one in the major browser category is Safari introduced by Apple Inc. But it is not in the competition with the other 3. Due to the relatively complex interface users other than Mac OS don't like it.