chrome/common/extensions/docs/examples/api/contentSettings/manifest.json

{
  "name" : "Content settings",
  "version" : "0.2",
  "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
}