Clear the search history in Firefox or Safari!
In Safari, simply clicking on the magnifying glass in the search bar will let you "Clear Recent Searches". The magnifying glass in Firefox's search bar doesn't work that way however. Clicking on the Google icon will only display a list of websites where you can search. Recent searches will be displayed automatically when you type. To clear the search history, you just have to right-click on the search bar and choose "Clear Search History".