Examine source code of cookie.txt

{
  "manifest_version": 2,
  "name": "cookie.txt",
  "version": "1.9",
  "description": "Exports your cookies super fast in a format compatible with wget",
  "short_name": "cookies",
  "permissions": [
    "activeTab",
    "cookies",
    "tabs",
    "webNavigation",
    "http://*/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_title": "Export cookies.txt",
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  }
}