Examine source code of NaT——Not a Theme

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "NaT",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-032-c7f80ac9e21af771c8d088973b1309ea.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(33, 77, 85, 0.81)",
      "toolbar_text": "rgba(175, 152, 51, 0.98)",
      "frame": "rgb(27, 50, 63)",
      "tab_background_text": "rgb(255, 216, 0)",
      "toolbar_field": "rgba(0, 0, 0, 0.79)",
      "toolbar_field_text": "rgb(144, 238, 144)",
      "tab_line": "rgb(46, 218, 228)",
      "popup": "rgb(32, 69, 69)",
      "popup_text": "rgba(248, 242, 153, 0.99)",
      "icons": "rgba(69, 251, 175, 0.98)",
      "ntp_text": "rgba(15, 217, 129, 0.98)",
      "popup_border": "rgba(22, 234, 239, 0.98)",
      "sidebar_border": "rgb(144, 223, 225)",
      "sidebar_text": "rgb(144, 238, 144)",
      "sidebar": "rgb(19, 76, 77)",
      "tab_loading": "rgb(46, 218, 228)",
      "tab_text": "rgb(0, 255, 255)",
      "toolbar_field_border": "rgb(33, 212, 212)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{265293ab-de7f-4d1c-9796-6ce1c3ed2cf8}"
    }
  }
}