Exactly what I wanted. Always after any search I had to go to the search bar and backspace delete the search query but with this that tension is no more and I can sit back relax and no more worry about past search showing up on the search bar. Thank you! Whose ever thought this is for the add-on is absolutely useful!
I was getting really aggravated with the way the previous search 'stuck' in the search bar in the Firefox Linux build, forcing me to clear it before typing a new search. This add-on may not have been created with the purpose of fixing that annoyance, but it definitley does the job. And it's perfect for its intended purpose as well. Great idea; smooth and lightweight implementation.