My Dad was frequently getting getting popups all over the screen while running chrome. A lot of the time they were preventing him seeing the page he was after, and an up to date Norton installation was happily claiming his machine was totally protected and running perfectly. It turned out to be browserfox/linkswift that somehow installed itself. How that doesn't qualify as malware is beyond me.
As a sidenote it was Ad-aware that finally nailed the culprit. I've finally managed to convince him to ditch Norton and just go with MSE.