Examine source code of Apple Blue Gradient

{
  "theme": {
    "images": {
      "theme_frame": "apple-blue.jpg"
    },
    "colors": {
      "frame": "#3399ff",
      "tab_background_text": "#0066cc"
    }
  },
  "version": "2.0",
  "name": "Apple Blue Gradient",
  "manifest_version": 2,
  "description": "A complementary Apple Persona sampled from the colors of the world's most famous blue apple ever placed in the top-left corner of a screen."
}