Examine source code of Google Day

{
  "theme": {
    "images": {
      "theme_frame": "Untitled-1.jpg"
    },
    "colors": {
      "frame": "#19e08d",
      "tab_background_text": "#0f0505"
    }
  },
  "version": "2.0",
  "name": "Google Day",
  "manifest_version": 2,
  "description": "Midnight Creation :)"
}