OPERA 21 VS FIREFOX 29 We compare Opera 21 to Firefox 29 to find out which is the fastest browser when using Html5, Octane, Peacekeeper and Sunspider with Operating System Windows XP and AMD Athlon X2 270 CPU. The reason we are still using Windows XP because we want to show that although Microsoft will no longer support Windows XP there are still secure browsers not made by Microsoft which do support Windows XP. We are using a basic AMD Athlon x2 270 which is dual core to show that non Microsoft browsers are also very fast even with limited CPU Power and Video Card Power."