I keep getting an ad at the bottom of the screen that hijacks me -- it scrolls the screen down to force me to watch the ad, and it won't release me until the ad is done. And then I scroll back up to whatever I'm reading or writing, and a few seconds later, the ad starts playing again, and I get pulled back down to the bottom of the screen. I can't pause it, I can't mute it, and I can't escape the tractor beam -- it took me 30 fucking minutes to write a post because I kept getting hijacked. It is really, really interfering with my ability to enjoy the site. Anyone else experiencing this? Any ideas for fixes? @5-yr-old Mac, Sierra 10.12.5, running Safari, FWIW.