Here's just a short story. Today, as I tried to browse Major League Baseball video, I got interrupted by a warning that my browser is out of date, with instructions to download. I was on Google Chrome. I was suspicious and did not do so. I closed the browser, tried MLB again, got to the same video and this time it played normally.
Webroot's daily scan (which ran later) did not identify any threats. It also did not intercept this message, although it might have interrupted me had I actually tried the download.