Want to hide what it is you have been looking for?  Not the perfect solution, but perfect for nit-picky peeps is the Clear Search add-on for Firefox.

What does this browser extension do?  It does one job, and it does it really well.  Once installed, it automatically clears the search bar after performing a search. So if you have a nosey roommate or family member, they won’t accidently see you have been searching for the top 10 horror villains of all time.

While this add-on for the browser isn’t enough to prevent somebody who is really nosey from going through your history, and doing a full scale investigation – it does serve the simple task or clearing out your search box after a search very well.  You can pick up the Clear Search extension on the Firefox add-ons web site.