If you type  names of websites in Firefox address bar  instead of redirecting to Google search page Browse By Name feature in Firefox 4 opens websites directly in the address bar.This feature is actually disabled in present Firefox 4 betas Browse By Name add-on for Firefox re-enables this feature.

enable Browse By Name feature in Firefox 4

If you are using latest version of Firefox 4 beta, you can install this add-on .So for example if you type Mozilla add-ons in address bar Mozilla add-ons page will be opened instantly without being redirected to Google search page.

Install Browse By Name add-on