Examine source code of Dark blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark blue",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(22, 32, 66)",
      "toolbar_text": "rgb(243, 245, 249)",
      "frame": "rgb(14, 19, 30)",
      "tab_background_text": "rgb(167, 182, 214)",
      "toolbar_field": "rgb(14, 19, 30)",
      "toolbar_field_text": "rgb(111, 135, 188)",
      "tab_line": "rgb(14, 19, 30)",
      "popup": "rgb(14, 19, 30)",
      "popup_text": "rgb(167, 182, 214)",
      "button_background_active": "rgb(32, 47, 97)",
      "button_background_hover": "rgb(32, 47, 97)",
      "frame_inactive": "rgb(14, 19, 30)",
      "icons_attention": "rgb(243, 245, 249)",
      "icons": "rgb(243, 245, 249)",
      "ntp_background": "rgb(11, 14, 24)",
      "ntp_text": "rgb(243, 245, 249)",
      "popup_border": "rgb(14, 19, 30)",
      "popup_highlight_text": "rgb(243, 245, 249)",
      "popup_highlight": "rgb(22, 32, 66)",
      "sidebar_border": "rgb(22, 32, 66)",
      "sidebar_highlight_text": "rgb(167, 182, 214)",
      "sidebar_highlight": "rgb(14, 19, 30)",
      "sidebar_text": "rgb(243, 245, 249)",
      "sidebar": "rgb(22, 32, 66)",
      "tab_selected": "rgb(22, 32, 66)",
      "tab_text": "rgb(243, 245, 249)",
      "toolbar_bottom_separator": "rgb(14, 19, 30)",
      "toolbar_field_border_focus": "rgb(111, 135, 188)",
      "toolbar_field_border": "rgb(14, 19, 30)",
      "toolbar_field_focus": "rgb(14, 19, 30)",
      "toolbar_field_highlight_text": "rgb(243, 245, 249)",
      "toolbar_field_highlight": "rgb(32, 47, 97)",
      "toolbar_field_text_focus": "rgb(167, 182, 214)",
      "toolbar_top_separator": "rgb(14, 19, 30)",
      "toolbar_vertical_separator": "rgb(243, 245, 249)",
      "tab_loading": "rgb(14, 19, 30)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{11470502-d73c-49c0-9409-4cf3d2135736}"
    }
  }
}