~6% worldwide, ~8% Europe, ~13% US according to to http://www.netmarketshare.com/ http://www.netmarketshare.com/ I would canonically count IE, Firefox, Chrome,

~6% worldwide, ~8% Europe, ~13% US according to to http://www.netmarketshare.com/ http://www.netmarketshare.com/ I would canonically count IE, Firefox, Chrome, Safari and Opera as "major browsers".