Examine source code of UtilityChill

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "UtilityChill",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(70, 74, 76)",
      "toolbar_text": "rgb(253, 253, 253)",
      "frame": "rgb(91, 139, 99)",
      "tab_background_text": "rgb(46, 49, 50)",
      "toolbar_field": "rgb(98, 98, 98)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(248, 112, 140)",
      "popup": "rgb(70, 74, 76)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(91, 139, 99)",
      "frame_inactive": "rgb(113, 166, 155)",
      "icons_attention": "rgb(239, 128, 99)",
      "icons": "rgb(227, 227, 237)",
      "tab_loading": "rgb(239, 128, 99)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{83787e40-5bb6-4fe2-b428-a9d000143f0f}"
    }
  }
}