Examine source code of Japan Neon

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Japan Neon",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.74)",
      "toolbar_text": "rgb(232, 0, 255)",
      "frame": "rgb(192, 54, 238)",
      "tab_background_text": "rgb(115, 215, 242)",
      "toolbar_field": "rgb(115, 215, 242)",
      "toolbar_field_text": "rgb(192, 54, 238)",
      "tab_line": "rgb(115, 215, 242)",
      "popup": "rgb(192, 54, 238)",
      "popup_text": "rgb(115, 215, 242)",
      "button_background_hover": "rgb(115, 215, 242)",
      "icons": "rgb(232, 0, 255)",
      "sidebar_text": "rgb(192, 54, 238)",
      "sidebar": "rgb(169, 237, 255)",
      "tab_text": "rgb(192, 54, 238)",
      "tab_loading": "rgb(115, 215, 242)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c51d1395-8d59-4296-ba1b-ba1b1288f150}"
    }
  }
}