Steps to Reproduce:

1. Startup a JIRA version 5.0 or later.
2. Go to General Configuration and switch on External User Management
3. Go to the User Browser, you'll be able to create or edit users
4. Go to the Group Browser, you'll be able to create or edit groups

Expected Results:

After External User Management is switch on, user or groups should not be possible to create or edit in the User or Group browser.

External User Management option description quote:

When turned ON, you will no longer be able to create, edit or delete users/groups from within JIRA (or via email or import); but you can still assign users/groups to project roles, and create/edit/delete user properties. Additionally, JIRA will not display options for users to change their password, or edit their profile.
Generally you would only turn this ON if you are managing all your users from outside JIRA (e.g. using Crowd, Microsoft Active Directory or another LDAP directory).

Actual Results:

• Admin still able to create or edit users or groups under the User or Group browser.