Inline auto-completion in the location bar in FireFox

Inline auto-completion in the location bar in FireFox: "

To enable this effect, you must add a preference that doesn't yet appear in the about:config list. Go to about:config, right-click anywhere on the page, and select New > Boolean from the context menu.

This menu choice yields a couple of dialog boxes. Enter browser.urlbar.autoFill when prompted by the first dialog box

Select true when you're prompted to select a value, and that's it: inline auto-complete for URLs is activated! There's no need to restart Firefox in this case; it works straight away.