Examine source code of Oldschool desktop

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "combo1",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(49, 52, 61, 0.86)",
      "toolbar_field": "rgb(3, 3, 3)",
      "toolbar_field_text": "rgb(90, 255, 9)",
      "tab_line": "rgb(218, 135, 124)",
      "popup": "rgb(17, 16, 16)",
      "popup_text": "rgb(90, 255, 9)",
      "tab_loading": "rgb(218, 135, 124)",
      "bookmark_text": "rgb(26, 160, 17)",
      "frame": "rgb(72, 80, 80)",
      "tab_background_text": "rgb(205, 247, 156)"
    }
  }
}