Examine source code of Secure Passwords

{
  "manifest_version": 2,
  "name": "Secure Passwords",
  "version": "3.0",
  "description": "Generates secure, unique passwords for easy copying and downloading.",
  "browser_action": {
    "default_popup": "index.html"
  },
  "icons": {
    "16": "icono/icono16.png",
    "48": "icono/icono48.png",
    "128": "icono/icono128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f3bbb1c5-39c8-4d25-bbdf-ca10c4ae2b44}"
    }
  }
}