Examine source code of Autumn

{
  "name": "Autumn",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "autumn.gif"
    },
    "colors": {
      "frame": "rgba(224, 108, 45, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(194, 91, 0, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(255, 140, 0, 1)",
      "toolbar_field_text": "rgba(128, 38, 0, 1)",
      "tab_line": "rgba(255, 119, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a4f6caba-9ae7-409f-b58c-c05f22633e25}"
    }
  }
}