Prep the Shrimp: Pat shrimp dry with paper towels. Toss shrimp with cornstarch, salt, and pepper. Let sit for 5 minutes.
Make the Firecracker Sauce: Mix buffalo sauce, brown sugar, apple cider vinegar, sriracha, garlic, ginger, red pepper flakes, soy sauce, and sesame oil in a bowl. Whisk until sugar is dissolved.
Cook the Shrimp: Heat oil in skillet over medium-high. Add shrimp in a single layer and cook for 2 minutes per side until crispy.
Add the Sauce: Pour sauce over shrimp and toss for 1-2 minutes until sauce thickens and coats shrimp.
Serve: Transfer shrimp to a dish, garnish with green onions, sesame seeds, and lime wedges. Drizzle with reserved sauce.