You're using Firefox and you're part of a home where several people use the computer. For this reason, you do not want to be tracked by the other members of your family or anyone. Know that you can easily edit the list of sites visited (history).
To remove the sites from your browser histroy, simultaneously press CTRL and H. This opens the History pane on the left. Then make a right click on any site appearing in the list and then click Delete.
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