Examine source code of Butterfly Gradient

{
  "theme": {
    "images": {
      "theme_frame": "Image1.jpg"
    },
    "colors": {
      "frame": "#bff77b",
      "tab_background_text": "#bff77b"
    }
  },
  "version": "2.0",
  "name": "Butterfly Gradient",
  "manifest_version": 2,
  "description": "Blue, green, and black butterfly gradient. "
}