Change Ctrl+Enter Behavior in Firefox

My good friend Daniel asked me yesterday how to change Firefox so that Shift+Enter auto-completes *.org instead of *.net. After about a 2 minute google session, I had the answer to share with everybody.

If you are unfamiliar with how this works, you can enter in howtogeek into the address bar, and use Ctrl+Enter instead of just hitting enter and Firefox will automatically complete it to www.howtogeek.com.