You can clear your browser history (or 'search history') if you don't want anyone to see what you've been looking at. Below is a guide on how to delete your search history. Please note, each browser (Firefox, Google Chrome, Internet Explorer ect) operates in a slightly different way.
1) Click on the 'History' button on the toolbar at the top of the page.
2) Click on the 'Clear Recent History' option.
3) Click the 'Clear now' button at the bottom of the pop-up box.