Examine source code of Amber Winter Night

{
  "name": "Amber Winter Night",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(36, 18, 3, 1)",
      "tab_background_text": "rgba(255, 255, 13, 1)",
      "toolbar": "rgba(38, 20, 3, 0)",
      "bookmark_text": "rgba(255, 251, 138, 1)",
      "toolbar_field": "rgba(38, 20, 3, 0.08)",
      "toolbar_field_text": "rgba(255, 253, 189, 1)",
      "tab_line": "rgba(255, 253, 189, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{821397e2-6858-467f-b164-7ac2c2245123}"
    }
  }
}