First question is are you trying to save it? If NOT then just grab it and pull. But these moldings have a metal insert inside and it will bend and make it junk.
If you want to save it, I have a slick tool at work for this but the best household item I can tell you to use is a wide, sharp, putty knife. Pull the molding back a little bit and just use the putty knife to cut the tape while keeping tension on the molding. It will come right off.