Examine source code of Second theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Second theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(89, 24, 139)",
      "toolbar_text": "rgb(104, 213, 16)",
      "frame": "rgb(115, 35, 177)",
      "tab_background_text": "rgb(104, 213, 16)",
      "toolbar_field": "rgb(115, 35, 177)",
      "toolbar_field_text": "rgb(0, 255, 49)",
      "tab_line": "rgb(119, 225, 34)",
      "popup": "rgb(22, 8, 27)",
      "popup_text": "rgb(98, 176, 183)",
      "tab_loading": "rgb(119, 225, 34)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5511889e-e1ed-40b8-b304-c122e53d1886}"
    }
  }
}