Preheat oven to 500. Line a small rimmed baking sheet with aluminum foil.
In a small bowl, combine cracker crumbs, blue cheese, bacon, and green onion. Add butter, stirring to mix well. Place tomatoes, cut sides up, on prepared baking sheet. Sprinkle tomato halves evenly with salt and pepper. Divide cracker mixture evenly amoung tomato halves.
Broil, 5 inches from heat, for 6 to 8 minutes, or until lightly browned.