Examine source code of Moz Sunset

{
  "name": "Sunset",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "FhOnTbFXEBoPNou.jpg"
    },
    "colors": {
      "frame": "rgba(227, 107, 16, 0.98)",
      "tab_background_text": "rgba(224, 207, 206, 1)",
      "toolbar": "rgba(173, 66, 41, 1)",
      "bookmark_text": "rgba(232, 232, 232, 1)",
      "toolbar_field": "rgba(59, 36, 36, 1)",
      "toolbar_field_text": "rgba(194, 50, 50, 1)",
      "tab_line": "rgba(199, 62, 62, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{68253647-047c-46de-94d2-ac75727d7c55}"
    }
  }
}