Once again, whether these pages appear in the browser history depends on the browser. That there’s downloading going on you didn’t explicitly ask for is typically not an issue because you’re busy reading the page you originally requested. When you click a link on the page, if all or even some of it has already been downloaded, it comes up much more quickly. Many web browsers now include a feature where they begin fetching the pages linked to in the page you’re currently viewing. You wouldn’t recognize them because they’re not pages you explicitly visited, but they’re present because they were part of some page you did go to. 1ĭepending on how your browser handles these requests, it’s possible that these page elements appear as individual entries in your history. What you see as a single URL may have fetched content from several different sites. Some webpages look like a single page but are actually a composite of more than one page or page fragments. You’ve never seen the site, but it’s there in the list. My theory is that the URLs behind blocked pop-ups sometimes still appear in your history because they were added to the list before the pop-up was blocked.
The blockers intercept the requests to create new browser windows and prevent them from opening. Pop-up blockers - now built into most browsers - keep pop-up and pop-under windows from displaying. They are additional browser windows created when you visit a site that are placed behind your current browser window so they’ll be visible when you minimize or exit the browser.
Pop-unders are similar, though they’ve fallen out of favor in recent years. These often 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? 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. Potentially Unwanted Programs (PUPs) in particular can add toolbars and other software to your system that intercept what you’re doing and just rudely take over, sending you to bogus search sites or worse. Malware sometimes works by forcing your browser to go places you would never go. With the exception of malware, most are benign. Sites can appear in your browsing history due to malware, blocked pop-ups and pop-unders, webpages built from other webpages, and browser pre-fetch features.
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