Congratulation to hooande. I remember when he mentioned it http://news.ycombinator.com/item?id=174900
Awesome Highlighter uses frames to view other websites and some websites prevent their pages to be viewed in someone else's frameset (if (top != self) top.location.href = 'example.com'). There is no way I know of to disable this and need to respect their wish not be viewed in frameset.