Do you use a popup blocker?
These things are just a pain anymore. They allow you to run around loaded down with thiefware of all types and never know it.
Meanwhile, the blocker is continuously fighting popups from a half dozen thiefware programs.
This is not good for your computer, slows it down, and worst of all, some programs are very harmful.
Popup blockers mask symptoms and allow the problem to flourish.
I do not use them anymore. If my computer is infested, I want to know about it asap.