Examine source code of kuroshitsuji

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "kuroshitsuji",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top",
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(63, 74, 102, 0.41)",
      "toolbar_text": "rgb(210, 149, 154)",
      "frame": "rgb(152, 208, 233)",
      "tab_background_text": "rgb(65, 63, 85)",
      "toolbar_field": "rgba(63, 74, 102, 0.59)",
      "toolbar_field_text": "rgb(210, 149, 154)",
      "tab_line": "rgb(63, 74, 102)",
      "popup": "rgb(217, 202, 203)",
      "popup_text": "rgb(63, 74, 102)",
      "button_background_active": "rgba(78, 49, 216, 0)",
      "tab_loading": "rgb(63, 74, 102)"
    }
  }
}