Examine source code of Doctor Stone

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Doctor Stone",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(139, 139, 139, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(12, 4, 16)",
      "tab_background_text": "rgb(108, 108, 108)",
      "toolbar_field": "rgb(24, 16, 40)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(12, 4, 16)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(80, 39, 155)",
      "button_background_hover": "rgb(39, 26, 66)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(39, 26, 66)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(255, 255, 255)",
      "popup_highlight_text": "rgb(52, 166, 16)",
      "popup_highlight": "rgb(39, 26, 66)",
      "sidebar_border": "rgb(255, 255, 255)",
      "sidebar_highlight_text": "rgb(52, 166, 16)",
      "sidebar_highlight": "rgb(39, 26, 66)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(12, 4, 16)",
      "tab_background_separator": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 255, 255)",
      "tab_selected": "rgb(39, 26, 66)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgb(255, 255, 255)",
      "toolbar_field_border": "rgb(255, 255, 255)",
      "toolbar_field_highlight_text": "rgb(52, 166, 16)",
      "toolbar_field_highlight": "rgb(39, 26, 66)",
      "toolbar_field_separator": "rgb(255, 255, 255)"
    }
  }
}