The last two nights the New Fairfield Volunteer Fire Department had been called to extinguish chimney fires. With the colder weather setting in, fire officials are reminding residents to get chimneys cleaned prior to use each year.  The New Fairfield Fire Marshal is also offering some Thanksgiving cooking safety tips.  Those include staying in the kitchen to keep an eye on the food, keeping children away from the stove and away from knives.  Fire officials note that the steam or splash from vegetables, gravy or coffee could cause serious burns.