@SIFATJ That would be your PC browser choice. For example, the game works just fine on Chrome, but is very limited (and not worth playing) on Internet Explorer.
Chrome (for one) and Internet Explorer are worlds apart. You should compare their specs sometime and consider upgrading. But I think Internet Explorer is like that because of HTML5 limitations. I don't keep track of IE's versions, though I had heard that IE 9 (not fully available yet) is supposed to have new support for that.