Examine source code of Autumn Dark Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Autumn A1",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(100, 50, 30, 0.6)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(101, 77, 65)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(149, 111, 97, 0.6)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(188, 65, 0)",
      "popup": "rgba(104, 52, 33, 0.49)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(33, 13, 3)",
      "popup_border": "rgb(191, 62, 0)",
      "tab_selected": "rgba(90, 49, 32, 0.5)",
      "tab_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(188, 65, 0)"
    }
  }
}