It is probably easy for you to identify people who could gain physical access to your computer—family members, roommates, co-workers, members of a cleaning crew, and maybe some others.
Lock or log-off your computer when you are away from it. This prevents another person from waiting for you to leave and then sitting down at your computer and accessing all of your information.
You should also be aware of your Internet cookies setting. Cookies are short pieces of data used by web servers to identify users. Some cookies are useful for storing images and data from websites that you frequent, but others are malicious and collect information about you. You'll have to decide how much risk from cookies you can accept.
One step towards protecting your privacy is to delete the cookies in your browser. Note that in addition to providing you with privacy from nosy ad tracking services, this will also delete any passwords or login information that you have saved in your frequently visited sites.
Press CTRL + Shift + DEL to open the Clear Browsing History window.
Press CTRL + Shift + DEL to open the Clear All History window.
Press CTRL + Shift + DEL to open the Clear Browsing Data window.