I'm having exactly the same issue tonight. Literally every time I open a page there's a pop-up window with some scam offer or porn offer - plain old malware, and those pages trying various simple devices to get the viewer to click on a "yes", "OK" or "download" button. It's something I haven't seen on the site for a very long time and never this grave.

I'm countering it by closing the pop-up window from the "staple" of windows in Chrome - I'm used to having several windows and tabs open online, so they'll stack up. Trying to close the window by clicking on any spot or nutton inside of it would just trigger some downloaded scam...But this is a real security risk, apart from making it veeeeeerry slow to navigate the site.