Examine source code of Red Firefly

{
  "name": "Red Firefly",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "preview_large (23).jpg"
    },
    "colors": {
      "frame": "rgba(18, 48, 112, 1)",
      "tab_background_text": "rgba(92, 46, 46, 1)",
      "toolbar": "rgba(110, 20, 20, 1)",
      "bookmark_text": "rgba(69, 45, 45, 1)",
      "toolbar_field": "rgba(224, 22, 22, 1)",
      "toolbar_field_text": "rgba(74, 18, 18, 1)"
    }
  }
}