If you just type pprune in the address bar, the shortcut Ctrl + Enter will add the www to the start and .com to the end.
This will work in Firefox and IE.
In Firefox the shortcut CTRL + Shift + Enter will add the www to the front and .org to the end.
You can get IE to do the same, but you must enter .org as the suffix in Tools > Internet Options > languages
http://support.mozilla.com/kb/Shortcuts
http://www.microsoft.com/windows/pro.../quickref.mspx