Although the Adblock Plus homepage indicates that autoplay videos will be blocked, this is definitely not the case. I even posted on the reviews section about this and was told that it should work. However, using chrome, it does not seem possible to block incoming loud and obnoxious videos from a number of sources, epitomized by Yahoo1 news. There is a chrome discussion on this topic that reveals there are many users annoyed beyond description with this -- chrome used to do native auto-blocking of them but has "turned this off", and I had hoped that Adblock+ would be able to do the job. If anyone has any ideas about this and how it might be accomplished, it would fall on welcome ears.