Ad popups - Separate windows with ads based on your browsing history or even whatever they find installed on your system. Ad injection - Putting ads on web pag

Ad popups - Separate windows with ads based on your browsing history or even whatever they find installed on your system. Ad injection - Putting ads on web pages they didn't write, such as Google search results. Ad substitution - Replacing ads on web sites with their own ads. Cookie stuffing - Injecting or clobbering referral cookies for sites like Amazon so that they get an undeserved commission on things you buy.