Examine source code of Whale Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Whale Dark",
  "theme": {
    "colors": {
      "toolbar": "#414141",
      "tab_line": "#414141",
      "tab_text": "#f8f9fa",
      "bookmark_text": "#f5f5f5",
      "frame": "#181818",
      "frame_inactive": "#252423",
      "tab_background_text": "#d8d8d8",
      "toolbar_field": "#414141",
      "toolbar_field_text": "#ffffff",
      "toolbar_field_text_focus": "#ffffff",
      "toolbar_field_focus": "#383838",
      "toolbar_field_border": "#414141",
      "toolbar_field_border_focus": "#383838",
      "toolbar_field_highlight": "#4ba7ee",
      "toolbar_field_highlight_text": "#ffffff",
      "toolbar_field_separator": "#707070",
      "toolbar_text": "#f5f5f5",
      "toolbar_top_separator": "#414141",
      "toolbar_bottom_separator": "#2b2b2b",
      "toolbar_vertical_separator": "#414141",
      "tab_background_separator": "#747474",
      "popup": "#323232",
      "popup_text": "#e4e4e4",
      "popup_border": "#303030",
      "popup_highlight": "#606060",
      "popup_highlight_text": "#ffffff",
      "tab_loading": "#181818",
      "tab_selected": "#414141",
      "sidebar": "#323232",
      "sidebar_highlight": "#424242",
      "sidebar_highlight_text": "#ffffff",
      "sidebar_text": "#f5f5f5",
      "sidebar_border": "#2b2b2b",
      "button_background_active": "#666666",
      "button_background_hover": "#5d5d5d",
      "icons": "#d9d9d9",
      "icons_attention": "#ffac00",
      "ntp_background": "#1d1e20",
      "ntp_link": "#e9e9e9",
      "ntp_text": "#e9e9e9"
    }
  }
}