Dissolve Jello, sugar, and salt in a large bowl, with the boiling water. Stir in the cold water and extracts and place in refrigerator to thicken slightly.
Once the cookies are crushed, add the melted butter and whirl in food processor until butter is well incorporated. Press into a pie pan and refrigerate until firm.
For meringue: In a small bowl, beat one egg white until soft peaks form, gradually add 2 Tbs sugar and beat until stiff peaks form.
Blend meringue with 2 cups Cool Whip.
Once the Jello is thickened, remove and set aside ½ cup for later use.
Gradually fold Cool Whip/meringue mixture into the remaining Jello, until well blended and smooth.
Spoon mixture into the chocolate crumb crust, using as much as possible, then drop dollops of the reserved clear Jell-o that was set aside and swirl with a knife.
Chill until firm.
Garnish with chocolate curls, if desired. (Any remaining filling can be chilled in sherbet cups for another meal.)