Examine source code of NotJustBeautiful

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "NotJustBeautiful",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-012-1e971c5fbb8dec3acbd76dd6c6819de9.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(20, 53, 55)",
      "toolbar_text": "rgb(248, 112, 140)",
      "frame": "rgb(184, 26, 22)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(121, 126, 183)",
      "tab_line": "rgb(248, 112, 140)",
      "popup": "rgb(111, 20, 132)",
      "popup_text": "rgb(98, 102, 183)",
      "tab_loading": "rgb(248, 112, 140)"
    }
  }
}