Examine source code of nocheOscura

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "darkestNight",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(18, 35, 48)",
      "toolbar_text": "rgb(140, 140, 172)",
      "frame": "rgb(18, 35, 48)",
      "tab_background_text": "rgb(140, 140, 172)",
      "toolbar_field": "rgb(25, 43, 52)",
      "toolbar_field_text": "rgb(140, 140, 172)",
      "tab_line": "rgb(18, 35, 48)",
      "popup": "rgb(18, 35, 48)",
      "popup_text": "rgb(140, 140, 172)",
      "button_background_active": "rgb(32, 57, 72)",
      "popup_border": "rgb(18, 35, 48)",
      "popup_highlight_text": "rgb(140, 140, 172)",
      "popup_highlight": "rgb(18, 35, 48)",
      "sidebar_border": "rgb(18, 35, 48)",
      "sidebar_highlight": "rgb(84, 108, 108)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(18, 35, 48)",
      "tab_background_separator": "rgb(18, 35, 48)",
      "tab_selected": "rgb(32, 57, 72)",
      "toolbar_bottom_separator": "rgb(18, 35, 48)",
      "toolbar_field_border": "rgb(18, 35, 48)",
      "toolbar_field_focus": "rgb(18, 35, 48)",
      "toolbar_top_separator": "rgb(18, 35, 48)",
      "tab_loading": "rgb(18, 35, 48)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7db7031e-25cc-408f-9be5-467f953a5d59}"
    }
  }
}