Examine source code of Content settings

{
  "name": "Content settings",
  "version": "3.2",
  "description": "Shows the content settings for the current site.",
  "permissions": [
    "contentSettings",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "contentSettings.png",
    "default_popup": "popup.html"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{79a88a26-ecf6-4a44-9818-eed9d4e822c3}"
    }
  }
}