Examine source code of City midnight

{
  "name": "Midnight",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "ezgif-2-e40dce52b3.gif"
    },
    "colors": {
      "frame": "rgba(120, 120, 122, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(38, 6, 0, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(156, 144, 144, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 0, 196, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3d2888be-3ca7-43a5-80e7-dcada8e1066b}"
    }
  }
}