Examine source code of Gradient Blue-White

{
  "theme": {
    "images": {
      "theme_frame": "Blue-White-fin.jpg"
    },
    "colors": {
      "frame": "#5f7eed",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Gradient Blue-White",
  "manifest_version": 2,
  "description": "A simple solid Gradient with the colors Blue and White, for your viewing pleasure."
}