Examine source code of Wallpaper from the 70s

{
  "name": "Wallpaper 1970's",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Wallpaper_70s.jpg"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(214, 90, 146, 1)",
      "toolbar": "rgba(255, 178, 84, 1)",
      "bookmark_text": "rgba(214, 90, 146, 1)",
      "toolbar_field": "rgba(244, 255, 94, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2317e13-fd0e-4de9-8b8e-d656820e83b0}"
    }
  }
}