Examine source code of Evenings Serenity

{
  "name": "Evenings Serenity",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "NightimeBeautyH.jpg"
    },
    "colors": {
      "frame": "rgba(17, 56, 103, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(17, 54, 105, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(31, 59, 97, 0.1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d975a6e5-a35b-4e84-828b-0724ca3b6377}"
    }
  }
}