Rated 5 out of 5 stars

You can find version working with firefox 3.0 here :

http://membres.lycos.fr/copilic/urlsuffix_0.3.7.xpi

For change the shortcup go to about:config and on filter write : urlsuffix.
there you can change what you want like :

urlsuffix.ctrl www.##urlsuffix##.com
urlsuffix.alt ftp.##urlsuffix##.com

This review is for a previous version of the add-on (0.3.3).