Press "Enter" in Add Contact window (Firefox only)

Preconditions:
You should add several contacts Jabber type

Steps to reproduce:

1. Open Profile page
2. Press "Edit" button
3. Press "Add more" button
4. In Contact type field select Jabber contact
5. In Contact value field enter one of first characters you enter before.
6. You should see combobox (see attachments) contact. Select one of them
7. Press "Enter" button

AR: Selected contact should be added
ER: Combobox is shown in profile page. In contact list added one character of step 5.

Note: This feature is reproduced in Contact Type Jabber, Twitter, Odnoklassniki only.