My theory is that the URLs behind blocked pop-ups sometimes still appear in your history, having been added to the list before the pop-up is blocked. The blockers intercept the requests to create new browser windows and prevent them. Pop-up blockers - now built into most browsers - keep pop-up and pop-under windows from displaying. Pop-unders are similar they are additional browser windows created when you visit a site, but placed behind your current browser window, so they’ll be visible when you exit the browser. These typically contain ads for which the site owner gets paid. Many websites employ pop-ups: additional browser windows that open when you visit the site. In particular, I suggest you run the tools outlined in How Do I Remove PUPs, Foistware, Drive-bys, Toolbars, and Other Annoying Things I Never Wanted? Traditional pop-ups and pop-unders These days, my first recommendation when you run into unexpected history entries is to make sure your machine has no malware. PUPs, in particular, can add toolbars and other software to your system that intercepts what you’re doing and just rudely takes over, sending you to bogus search sites or worse.
Malware often works by forcing your browser to go places you would never go. It’s possible your browser may simply be doing a good job protecting you. However, there are many more benign scenarios. I’ll also call out “ foistware” or Potentially Unwanted Programs ( PUPs) - software that appears on your system unexpectedly after installing something else.
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