Unwanted Popups and Missing Safari Preferences
Getting lots of popups on Safari on my iMac. MacOS High Sierra, Version 10.13.6 (17G65). Safari Version 12.0 (13606.2.11). Went to Safari> Preferences> Security. There are only Fraudulent Sites and Web Content selections with no options to block pop-ups. My only Safari Extension is Norton Safe Web 2.11.0.30. Am at a loss on how to block the popups. Is the lack of a setting for same in the Safari Preferences caused by Norton?
iMac (27-inch, Late 2012), macOS High Sierra (10.13.6)