Examine source code of Automn forest

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Automn forest",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(7, 6, 32, 0.7)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(23, 26, 48)",
      "tab_background_text": "rgb(220, 224, 229)",
      "toolbar_field": "rgb(54, 58, 89)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(170, 91, 28, 0)",
      "popup": "rgb(31, 34, 61)",
      "popup_text": "rgb(215, 226, 239)",
      "tab_selected": "rgb(54, 58, 89)",
      "tab_loading": "rgba(170, 91, 28, 0)"
    }
  }
}