There was a time when only Scrooge would have thought of firing a worker at Christmas. But those days are gone. As 1995 draws to a close, workers are getting pink slips at an accelerating pace. Less than two weeks before Christmas, 2,700 workers at Kimberly-Clark Corp. - maker of family-friendly products such as Huggies diapers - were given the boot, amid a merger with Scott Paper Co. On Tuesday, Polaroid Inc. announced it will eliminate 1,300 jobs in a restructuring designed to cut costs and refocus some of its operations. The job cuts amount to more than 10 percent of Polaroid's work force of 11,300. The bad news also was delivered in December to workers at First Security Corp., based in Salt Lake City. At America West Airlines in Phoenix. At Grand Union supermarkets in Wayne, N.J. At Knight-Ridder Inc.'s Press-Telegram in Long Beach, Calif. Add those - and many others - to November's avalanche at such corporate giants as IBM, 3M and AT&T.