Examine source code of Apple Gradient

{
  "theme": {
    "images": {
      "theme_frame": "persona-header2.jpg"
    },
    "colors": {
      "frame": "#878787",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Apple Gradient",
  "manifest_version": 2,
  "description": "A persona with a green Apple logo and a gradient of blue, green, and black."
}