There are a number of web pages that automatically play videos whenever you visit them. What McAfee activates Web Boost does is stop these videos from auto-playing. The paused videos display a blue badge on them and this means that Web boost has restricted them from playing automatically. You can always play these videos by clicking on the “Paused by McAfee Web Boost” message. You can also click on the “Play” button to play them again. In order to restrict mcafee web boost from blocking the videos or whitelisting them, do as described: