Examine source code of MinecraftBackground

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Minecraft",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(92, 57, 8)",
      "toolbar_text": "rgb(148, 143, 255)",
      "frame": "rgb(139, 213, 255)",
      "tab_background_text": "rgb(3, 0, 130)",
      "toolbar_field": "rgb(24, 130, 18)",
      "toolbar_field_text": "rgb(0, 22, 255)",
      "tab_line": "rgb(151, 11, 200)",
      "popup": "rgb(54, 58, 119)",
      "popup_text": "rgb(0, 5, 94)",
      "tab_loading": "rgb(151, 11, 200)"
    }
  }
}