Examine source code of Night&Day

{
  "theme": {
    "images": {
      "theme_frame": "GooglePersonas.jpg"
    },
    "colors": {
      "frame": "#171717",
      "tab_background_text": "#f0f0f0"
    }
  },
  "version": "2.0",
  "name": "Night&Day",
  "manifest_version": 2,
  "description": "I did a little 3d render to personalize my fox, hope you can enjoy it :)"
}