These are bricks coupon. They are single use only. Each coupon has its own code that goes invalid once used. You should be able to print two using FF and two using IE.

From Oprah Show- Free 2pc KFC Grilled Meal (printable coupon)
Meal includes two sides and a biscuit
Coupon available for printing from 9am CDT 5/5/09 to 9:59pm CDT 5/6/09. Coupon is redeemable at participating KFC® locations in the U.S. from 5/5/09 to 5/19/09, excluding 5/10/09.