I hate ask a dumb question, but I'm trying to block popup windows in Safari on an iMac--you know, those windows to participate in surveys or subscribe to a website's newsletters. I've read plenty of online help, and they all include instructions to check "block popup windows." When I enter Safari's preferences and security tab, there is no option to block popup windows. Did I miss something? Does that option appear elsewhere?I'm using MacOS Mojave 10.14 with Safari 12.0. Thanks.