Examine source code of Gradient White Light

{
  "theme": {
    "images": {
      "theme_frame": "Gradient_White_Light_1.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#666666"
    }
  },
  "version": "2.0",
  "name": "Gradient White Light",
  "manifest_version": 2,
  "description": "Clear, unadorned, nice looking. Simple as can be."
}