Examine source code of Spiderman New Generation

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "New Generation",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(15, 15, 54)",
      "toolbar_text": "rgb(232, 216, 237)",
      "frame": "rgb(62, 88, 102)",
      "tab_background_text": "rgb(232, 216, 237)",
      "toolbar_field": "rgb(66, 69, 77)",
      "toolbar_field_text": "rgb(234, 218, 237)",
      "tab_line": "rgb(235, 179, 237)",
      "popup": "rgb(172, 172, 178)",
      "popup_text": "rgb(251, 251, 251)",
      "button_background_active": "rgb(254, 254, 254)",
      "toolbar_bottom_separator": "rgb(249, 248, 255)",
      "tab_loading": "rgb(235, 179, 237)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{09d8931f-d3b5-4b52-9bff-3589e9551424}"
    }
  }
}