Internet Explorer: Tools -> Internet Options -> Privacy -> Settings. For more information, you can consult the support of Microsoft or the browser’s Help.
Firefox: Tools -> Options -> Privacy -> History -> Personalised Settings. For more information, you can consult the support of Mozilla or the browser’s Help.
Chrome: Settings -> Show advanced options -> Privacy -> Content settings. For more information, you can consult the support of Google or the browser’s Help.
Safari: Preferences -> Security. For more information, you can consult the support of Apple or the browser’s Help.