Lately any website I go to with Safari will -after a few seconds- will surprise me with a ‘pop up’ notifying me that I have ‘won’ something, either from Walmart or from Amazon. I’m using the Safari ‘pop up block’ feature, but it still comes up. I also clear any web data. When I checked under ‘Advanced’ I find web data from ‘Variety.com’ . It seems impossible to get rid of this. These annoying pop ups do not occurr when using any other browser , like Chrome, Firefox, or now Edge. Is this a virus?