Divide cracker crumbs evenly between 2 pie tins, saving a few crumbs for top. Soften cream cheese in large bowl and add sugar and mix well. Add egg yolks to above and mix, then add vanilla and salt. Beat 1 package of Dream Whip and fold into mixture, then beat 3 egg whites and fold in. Pour into prepared pans and sprinkle crumbs on top. Place in freezing unit for at least 8 hours. Keep it frozen until serving time.