If you like being lazy and want to browse sites you don't have in your bookmarks already in the fastest possible way, there is a Firefox option that lets you determine what happens with expressions entered into the url bar.
How to Customize Firefox with about:config
Apart from the wide variety of plugins available for Mozilla Firefox and the option to configure it in the Preferences window, there is another, slightly more hidden feature to customize Firefox' behavior . To access it, enter about:config into your