Examine source code of The Night

{
  "name": "The Night",
  "manifest_version": 2,
  "version": "17.0",
  "theme": {
    "images": {
      "theme_frame": "thenighht-4.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(240, 240, 240, 1)",
      "toolbar": "rgba(3, 3, 3, 1)",
      "bookmark_text": "rgba(245, 245, 245, 1)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(245, 245, 245, 1)",
      "tab_line": "rgba(255, 255, 255, 0.28)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b6f892e3-2983-4566-981c-4ea4f4169a46}"
    }
  }
}