Examine source code of Password Extractor

{
  "manifest_version": 2,
  "name": "Serial Extractor",
  "version": "1.0",
  "description": "إضافة تعرض آخر 8 أرقام من السيريال",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "serialextractor@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}