Examine source code of Cosmic Glass Dark

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Cosmic Glass Dark",
  "theme": {
    "colors": {
      "toolbar": "rgb(18, 24, 33)",
      "toolbar_text": "rgb(230, 237, 243)",
      "frame": "rgb(11, 15, 20)",
      "tab_background_text": "rgb(207, 216, 220)",
      "toolbar_field": "rgb(24, 34, 44)",
      "toolbar_field_text": "rgb(230, 237, 243)",
      "tab_line": "rgb(24, 34, 44)",
      "popup": "rgb(18, 24, 33)",
      "popup_text": "rgb(230, 237, 243)",
      "button_background_active": "rgb(30, 42, 54)",
      "button_background_hover": "rgb(36, 50, 65)",
      "frame_inactive": "rgb(10, 15, 20)",
      "icons_attention": "rgb(241, 245, 249)",
      "icons": "rgb(200, 211, 220)",
      "ntp_background": "rgb(11, 15, 20)",
      "ntp_text": "rgb(230, 237, 243)",
      "popup_border": "rgb(28, 39, 51)",
      "popup_highlight_text": "rgb(241, 245, 249)",
      "popup_highlight": "rgb(30, 47, 63)",
      "sidebar_border": "rgb(28, 39, 51)",
      "sidebar_highlight_text": "rgb(241, 245, 249)",
      "sidebar_highlight": "rgb(30, 47, 63)",
      "sidebar_text": "rgb(207, 216, 220)",
      "sidebar": "rgb(15, 20, 26)",
      "tab_background_separator": "rgb(15, 20, 26)",
      "tab_loading": "rgb(76, 194, 255)",
      "tab_selected": "rgb(22, 32, 43)",
      "tab_text": "rgb(207, 216, 220)",
      "toolbar_bottom_separator": "rgb(28, 39, 51)",
      "toolbar_field_border_focus": "rgb(28, 39, 51)",
      "toolbar_field_border": "rgb(28, 39, 51)",
      "toolbar_field_focus": "rgb(28, 39, 51)",
      "toolbar_field_highlight_text": "rgb(241, 245, 249)",
      "toolbar_field_highlight": "rgb(34, 48, 61)",
      "toolbar_field_separator": "rgb(28, 39, 51)",
      "toolbar_field_text_focus": "rgb(241, 245, 249)",
      "toolbar_top_separator": "rgb(28, 39, 51)",
      "toolbar_vertical_separator": "rgb(22, 32, 43)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d8f6f4b4-9325-4137-b842-5190c922b19f}"
    }
  }
}