Examine source code of Treetops at Night

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Treetops at Night",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(39, 30, 69)",
      "toolbar_text": "rgb(228, 228, 238)",
      "frame": "rgb(134, 127, 134)",
      "tab_background_text": "rgb(228, 228, 238)",
      "toolbar_field": "rgb(71, 65, 82)",
      "toolbar_field_text": "rgb(228, 228, 238)",
      "tab_line": "rgb(224, 224, 238)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(56, 56, 63)",
      "tab_loading": "rgb(224, 224, 238)"
    }
  }
}