Examine source code of dunkel1

{
  "name": "dunkel1",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "leer1.png"
    },
    "colors": {
      "frame": "rgba(36, 36, 36, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(66, 66, 66, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(214, 209, 120, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(29, 108, 204, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{25238935-8c59-4ca5-9802-fb448cbe58c1}"
    }
  }
}