For a while, the easiest way to do this was Flashblock... then JS and HTML5 caught up to Flash's anti-feature-set. There are some ideas here, along the content

For a while, the easiest way to do this was Flashblock... then JS and HTML5 caught up to Flash's anti-feature-set. There are some ideas here, along the content-type-blocking route: https://news.ycombinator.com/item?id=12131329 https://news.ycombinator.com/item?id=12131329