Examine source code of Paradise-Theme-FF

{
  "name": "Paradise",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "transparent-image.png"
    },
    "colors": {
      "frame": "rgba(21, 21, 21, 1)",
      "tab_background_text": "rgba(232, 227, 227, 1)",
      "toolbar": "rgba(21, 21, 21, 1)",
      "bookmark_text": "rgba(232, 227, 227, 1)",
      "toolbar_field": "rgba(21, 21, 21, 1)",
      "toolbar_field_text": "rgba(232, 227, 227, 1)",
      "tab_line": "rgba(232, 227, 227, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{457055ea-4c45-4abf-93fe-10418857d41c}"
    }
  }
}