Examine source code of Grass Block Theme MC

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Minecraft Grass Block",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(173, 113, 61)",
      "toolbar_text": "rgb(133, 181, 65)",
      "frame": "rgb(222, 116, 27)",
      "tab_background_text": "rgb(164, 220, 255)",
      "toolbar_field": "rgb(106, 172, 210)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(121, 63, 17)",
      "popup_text": "rgb(255, 153, 73)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  }
}