I often leave out the stupid www. in front of host names, but some websites don't have a dns-entry for the hostname without www. and it would be handy if firefix could correct this too, but it does not.
It works, and is a good idea! It doesn't solve a very big problem, but it's ncie to have these little enhancements. I would like an option to set it to automatically take me to the most probable suggestion (with a notice telling me it's done so).