Examine source code of white wallpaper

{
  "name": "white wallpaper",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "white wallpaper.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{64df43c5-6484-4f6c-8d5d-076b4edadd39}"
    }
  }
}