Examine source code of SushiDarkLand

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "SushiDarkLand",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-016-0cce7a5c7842040fcc0e297a42678307.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(18, 15, 15, 0.94)",
      "toolbar_field": "rgb(46, 41, 41)",
      "toolbar_field_text": "rgb(191, 191, 191)",
      "tab_line": "rgb(173, 173, 171)",
      "popup": "rgb(29, 27, 27)",
      "popup_text": "rgb(191, 191, 191)",
      "tab_loading": "rgb(173, 173, 171)",
      "bookmark_text": "rgb(191, 191, 191)",
      "frame": "rgb(41, 40, 40)",
      "tab_background_text": "rgb(191, 191, 191)"
    }
  }
}