Place strawberries and sugar in a food processor; cover and process until finely ground. Transfer to a small bowl, add salt; set aside.
In a large pot over medium heat, cook popcorn kernels and oil until oil begins to sizzle. Cover and shake for 2-3 minutes or until popcorn stops popping.
Transfer to a large bowl; toss with melted butter. Add strawberry mixture and toss to coat. Continue spritzing and tossing until popcorn is coated.