This is just a quick post. Today while I was working with the blog I accidentally came to know these keyboard shortcuts for auto address completion in Firefox.
CTRL+ENTER as we all know complete with http://www. .com
SHIFT+ENTER complete with http://www. .net
CTRL+SHIFT+ENTER complete with http://www. .org
Update 1 :
Firefox can insert the prefix and postfix in the correct place automatically. That is if you type exnol/about and press CTRL+ENTER then the address is corrected as http://www.exnol.com/about-me.
You may also like to read about the Windows Keyboard shortcuts