On older systems, you can Force Quit Safari and then hold down the Shift key and restart Safari. The next time the dialog appears, you will be able to close it permanently. In recent versions of macOS, you can click OK or press the Return key (useful if the pop-up is partially off the screen) to close the pop-up. If you restart Safari, the pop-up returns. While browsing the internet, a dialog pops up telling you that: This tip is about one specific scam - the Safari pop-up. There is an epidemic of all types of scams today - from duct cleaning to water heaters. Here are some tips that I have collected from helping people at Apple Support Communities.
