I did some research and the McDonald's fries here in the states are not vegan friendly. Are you sure they are vegan friendly in your part of the world?
yes they are vegan in the uk, i’m very sure of that :)
you can get info here. it’s mainly about the patties but it also states "(Our French Fries, which have been approved by the Vegetarian Society, are cooked using different equipment and are entirely segregated from the other products.)"
the ingredients are :
Potatoes, Vegetable Oil (Sunflower, Rapeseed), Dextrose (only added at beginning of season). Prepared in the restaurants using a non-hydrogenated vegetable oil. Salt is added after cooking.