You already know you can use Ctrl+Enter to avoid typing http://www or .com when entering URLs in the Firefox address bar. Along those same lines, you can even go to a web site’s subpages without typing the protocol or top level domain. Try it: type
apple/trailersinto the Firefox address bar and press Ctrl+Enter (Cmd+Enter for Mac users). Her Foxiness will fill in the http://www and .com in all the right places and zip you right along to Apple’s Trailers section of the site. Same works for
lifehacker/software/downloads, too. Nifty!
You can also use shift+enter in a similar way, it wraps “www.” and “.net” around whatever you type.