Examine source code of JSON + XML Viewer

{
  "manifest_version": 2,
  "name": "JSON + XML Viewer",
  "version": "1.3",
  "description": "Automatically formats JSON with embedded XML support, like Firefox's built-in JSON viewer",
  "browser_specific_settings": {
    "gecko": {
      "id": "{8a1ac536-ca57-4152-85f5-05ac47643169}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "viewer.html",
    "viewer.js",
    "viewer.css"
  ]
}