who care these days about things like that?
at least I know by typing a word and press enter firefox itself redirect me to the site of it by searching it in google.
for example when I type avast and press enter, official site of avast load, and many more example, or when I type Avril Lavigne, home page of Avril Lavigne load. so, www and com and shortcuts such as ctrl+enter is not a problem anymore!
maybe it's because I've Google Desktop installed in my computer... I'm not sure