I also experienced this. I opened a tab to the forum, and three articles from the main site. One of the tabs had the popup that only gives you the choice to click Ok. When this has happened in the past, I would close all apps, then open Chrome, and quickly hit the tabs button and swipe away all the open tabs. The S8 was too quick for that. So I did a Google search (in another browser) to see how to close that kind of pop up without anything bad happening. And I learned (from a post on this forum, ironically) that you can hit the back button to close the popup. So I did that and quickly closed the tabs.
So yeah, I like this site. But how about let's not have this crap?