Examine source code of Damona Yo-kai Watch

{
  "manifest_version": 2,
  "version": "4.0",
  "name": "Damona",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(102, 72, 128, 0.6)",
      "toolbar_text": "rgb(206, 186, 180)",
      "frame": "rgb(116, 95, 141)",
      "tab_background_text": "rgb(206, 186, 180)",
      "toolbar_field": "rgb(113, 91, 139)",
      "toolbar_field_text": "rgb(235, 240, 247)",
      "tab_line": "rgb(71, 64, 63)",
      "popup": "rgb(88, 58, 109)",
      "popup_text": "rgb(203, 206, 214)",
      "button_background_hover": "rgb(214, 74, 243)",
      "icons_attention": "rgb(206, 186, 180)",
      "ntp_background": "rgb(48, 27, 71)",
      "ntp_text": "rgb(235, 240, 247)",
      "popup_highlight_text": "rgb(206, 186, 180)",
      "popup_highlight": "rgb(214, 74, 243)",
      "sidebar_highlight_text": "rgb(203, 206, 214)",
      "sidebar_highlight": "rgb(214, 74, 243)",
      "sidebar_text": "rgb(235, 240, 247)",
      "sidebar": "rgb(88, 58, 109)",
      "tab_text": "rgb(235, 240, 247)",
      "toolbar_bottom_separator": "rgb(71, 64, 63)",
      "toolbar_field_border_focus": "rgb(206, 186, 180)",
      "toolbar_field_highlight": "rgb(214, 74, 243)",
      "toolbar_top_separator": "rgba(48, 27, 71, 0)",
      "toolbar_vertical_separator": "rgba(48, 27, 71, 0)",
      "tab_loading": "rgb(71, 64, 63)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2b4c4fee-b6b1-467c-aef0-59120c6c9b21}"
    }
  }
}