Examine source code of Aquarell

{
  "name": "Aquarell",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "blue-marmor.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(102, 81, 59, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(27, 51, 50, 0.8)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(204, 144, 84, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e92d216f-b828-42f9-98a5-2c0a139ab1a8}"
    }
  }
}