From MozillaZine Knowledge Base
Firefox 3 nightlies experimented with several improvements to the Location Bar. Among them was the ability to hide the protocol (scheme) of the current URL when the Location Bar wasnâ€™t focused. This feature was removed prior to release.
Possible values and their effects
A space-separated list of protocols. If the current URLâ€™s protocol is in this list, it is not displayed in the Location Bar. By default this preference is an emtpy string (hide no protocols).
First checked in
2007-06-27 by Gavin Sharp (patch by DÃ£o Gottwald)
Has an effect in