com.apple.Safari.install-ephemeral-extensions - Overview of the macOS Authorization Right

macOS 10.11 / 10.12 / 10.13 / 10.14

{
  'allow-root' : 'false',
  'authenticate-user' : 'true',
  'class' : 'user',
  'comment' : 'This is the right used by Safari to install an ephemeral extension without a developer certificate present.',
  'session-owner' : 'true',
  'shared' : 'false',
  'timeout' : '0',
  'tries' : '10000'
}