Examine source code of Gray Mickey

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gray Mickey",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(202, 79, 79, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(46, 46, 48)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(158, 4, 0)",
      "tab_line": "rgba(199, 2, 2, 0.02)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgba(199, 2, 2, 0.02)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4b101fd6-bc94-4e94-8af1-8901fae583dc}"
    }
  }
}