Refrigerator fiberglass exposure
The fiberglass itself is not really a serious hazard like asbestos would be, unless it gets into your food or on containers. Not a good idea to have exposed fiberglass near your food however.  You should seal the hole with duct tape or something to keep the fiberglass from getting on your stuff.  If the missing piece of door is too big or you can't confine the fiberglass,  you should consider getting a new fridge ASAP.