Examine source code of Undertale LateNight 2.0

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Undertale LateNight Update 2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(74, 74, 74, 0.23)",
      "toolbar_text": "rgb(114, 125, 252)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(240, 115, 115)",
      "toolbar_field": "rgb(53, 60, 106)",
      "toolbar_field_text": "rgb(240, 115, 115)",
      "tab_line": "rgb(208, 56, 51)",
      "popup": "rgb(53, 60, 106)",
      "popup_text": "rgb(240, 115, 115)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)",
      "tab_loading": "rgb(208, 56, 51)"
    }
  }
}