Examine source code of Neon Halloween

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Neon Halloween",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-018-0ca3dfc7bb661ec53999d358812ce0ab.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(231, 142, 52)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(231, 142, 52)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 20, 147)",
      "tab_line": "rgb(255, 20, 147)",
      "popup": "rgba(0, 0, 0, 0.9)",
      "popup_text": "rgb(231, 142, 52)",
      "icons": "rgb(176, 38, 255)",
      "ntp_background": "rgb(0, 0, 0)",
      "ntp_text": "rgb(231, 142, 52)",
      "popup_border": "rgb(255, 20, 147)",
      "sidebar_border": "rgb(255, 20, 147)",
      "sidebar_text": "rgb(231, 142, 52)",
      "sidebar": "rgb(0, 0, 0)",
      "tab_text": "rgb(176, 38, 255)",
      "toolbar_bottom_separator": "rgb(255, 20, 147)",
      "toolbar_field_border_focus": "rgb(231, 142, 52)",
      "toolbar_field_border": "rgb(176, 38, 255)",
      "toolbar_field_focus": "rgba(0, 0, 0, 0.5)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(176, 38, 255)",
      "toolbar_top_separator": "rgb(255, 20, 147)",
      "toolbar_vertical_separator": "rgb(255, 20, 147)",
      "tab_loading": "rgb(255, 20, 147)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a6b8d77a-e911-4a91-bd71-e39ae55dbd61}"
    }
  }
}