You should understand that it's 6 yrs and 75K from when you bought the vehicle, not after the original warranty expires.
So since Ford already gives you a a 5/60K powertrain warranty you're only getting an extra 1 yr/15K of coverage. You would be getting an extra 3 yrs/39K coverage on most of the rest of the vehicle but the ESP doesn't cover quite as much as the original Bumper to Bumper warranty.