Examine source code of CampFire USA

{
  "name": "Kei Kurono",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Kei Kurono.png"
    },
    "colors": {
      "frame": "rgba(176, 176, 176, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(128, 128, 128, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(153, 153, 153, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{378769aa-1028-4c3b-9c5e-4739fabd3386}"
    }
  }
}