NoScript just got better! The latest update to NoScript has clickjacking blocked by default!
For complete information, read the description by the NoScript developer at Hello ClearClick, Goodbye Clickjacking!
Update (Hat Tip R-C): In Webcam hijack demo highlights clickjacking threat is information regarding a demo of clickjacking:
"In Guy Aharonovsky’s demo game, a Web page is set up to seamlessly hide another page in the background that’s actually managing the target’s Adobe Flash Player privacy settings manager.
Using a series of clicks bouncing around the rigged page, Aharonovsky is able to silently hijack the user’s clicks to modify the Flash privacy settings and take complete control of the installed webcam.
If you don’t want to try it or don’t have a webcam connected, you can see the attack in action in this YouTube video. YouTube video"