The ornamental design for a fridge/freezer miser, as shown.
FIG. 1: is the entire device shown as the back view; and,
FIG. 2: is the entire device shown as the front view.
The fridge/freezer miser is a new device that allows the refrigerator to operate half the amount of time maintaining constant food temperature at the same rate. This saves energy for the user and reduces the amount of the electric bill on a monthly basis.