Description of problem:
 "OK" button is not focused on "Operations Error" dialog, once we opened "show
details"

Version-Release number of selected component (if applicable):
ipa-server-3.3.3-6.el7.x86_64
browser version:FirefoxESR 24.2.0 and Firefox 26.0

How reproducible:
100%

Steps to Reproduce:
1.Login as admin user
2.Navigate to "Identity->Users"
3.Select admin
4.click delete
5.hit delete to confirm
6.we will get a error message
7.Focus "Show details" label on error dialog with "Tab" key and press enter

Actual results:
Ok button is not highlighting by key board.So need to be confirmed with a mouse
click.

Expected results:
OK button should be focused by key board (TAB key)

Additional info:
Before entering "Show Details" we can focus OK button with "Tab" Key