Examine source code of Tabletop Cthulhu

{
  "name": "Tabletop Cthulhu",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Tabletop Cthulhu.png"
    },
    "colors": {
      "frame": "rgba(34, 74, 66, 1)",
      "tab_background_text": "rgba(214, 132, 117, 1)",
      "toolbar": "rgba(35, 77, 70, 0.48)",
      "bookmark_text": "rgba(214, 132, 117, 1)",
      "toolbar_field": "rgba(11, 31, 28, 0.44)",
      "toolbar_field_text": "rgba(67, 207, 111, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5aca3e24-2b11-4271-9a1b-b3c69d565b14}"
    }
  }
}