Examine source code of Halloween theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Halloween",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(49, 44, 43)",
      "toolbar_text": "rgb(159, 126, 32)",
      "frame": "rgb(150, 68, 198)",
      "tab_background_text": "rgb(245, 186, 17)",
      "toolbar_field": "rgba(104, 57, 7, 0)",
      "toolbar_field_text": "rgb(159, 126, 32)",
      "tab_line": "rgb(253, 124, 73)",
      "popup": "rgb(49, 44, 43)",
      "popup_text": "rgb(159, 126, 32)",
      "ntp_background": "rgb(36, 31, 28)",
      "ntp_text": "rgb(253, 153, 73)",
      "popup_border": "rgb(249, 166, 1)",
      "popup_highlight_text": "rgb(170, 117, 107)",
      "popup_highlight": "rgb(78, 37, 5)",
      "sidebar_border": "rgb(249, 166, 1)",
      "sidebar_highlight": "rgb(232, 62, 28)",
      "sidebar_text": "rgb(210, 123, 53)",
      "sidebar": "rgb(49, 44, 43)",
      "tab_loading": "rgb(225, 99, 36)",
      "tab_text": "rgba(102, 75, 94, 0.86)",
      "toolbar_bottom_separator": "rgb(208, 74, 49)",
      "toolbar_field_highlight_text": "rgb(219, 186, 180)",
      "toolbar_field_highlight": "rgba(53, 10, 41, 0.86)",
      "toolbar_field_separator": "rgb(79, 39, 32)",
      "toolbar_top_separator": "rgb(249, 41, 0)",
      "toolbar_vertical_separator": "rgba(247, 145, 8, 0.86)"
    }
  }
}