Piracy might be one of the reasons. But there is another possible reason - underpowered machines. Unlike the western world, owning a computer is still a luxury here (India). Most people are stuck with old machines where firefox and chrome are terribly slow.
I was expecting India to have a much higher share. But as statcounter's stats[1] suggests, chrome already has ~25% share. IE in general and IE6 in particular are losing market share drastically. This is a welcome trend.
[1] http://gs.statcounter.com/#browser-IN-monthly-201002-201102