Examine source code of Ethereal Koi

{
  "name": "Ethereal Koi",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Ethereal Koi.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(173, 104, 173, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(173, 104, 173, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(230, 151, 106, 1)",
      "tab_line": "rgba(255, 255, 226, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{104b578d-b097-4c4c-a2d1-826cf2b4e959}"
    }
  }
}