Examine source code of Kuromi

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Kuromi",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x",
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(35, 35, 35, 0.78)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(76, 38, 88)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(30, 30, 30, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 255, 255, 0.12)",
      "popup": "rgb(30, 30, 30)",
      "popup_text": "rgb(255, 255, 255)",
      "frame_inactive": "rgb(64, 44, 72)",
      "icons_attention": "rgb(157, 72, 185)",
      "toolbar_bottom_separator": "rgba(30, 30, 30, 0.92)",
      "toolbar_field_border_focus": "rgb(127, 74, 146)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0.2)",
      "tab_loading": "rgba(255, 255, 255, 0.12)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{da71ff8b-90ee-4719-9974-fac8f44528a1}"
    }
  }
}