Exactly tverbeek: I immediately thought of the iPhone webapps when I read about Mozilla's "threat."

http://apple.com/webapps

As Steve Jobs proposed with iPhone 1.0, developers were urged to push the capabilities of web technology to develop web applications for the iPhone. Today there are 4293 tuned web pages that take advantage of the technology the iPhone has to offer. For instance, the Most Recent under All Categories web app that loaded for me this evening was one that used the web browser and the GPS. Web apps can take advantage of the iPhone's hardware and software and not have to be run through the App Store. I have always thought that the only failure of the iPhone was that nobody developed a richer Internet that took advantage of a mobile Internet device like the iPhone.

BrainPop has a fun free video about computer viruses, worms, and trojan horses:

http://www.brainpop.com/technology/computersandinternet/computerviruses/

I particularly like BrainPop because the videos are appropriate for younger people and contain enough humor that they don't pander to adults. Have your family members watch this video so they better understand what a virus does to the computers and how they can avoid messing up their computers.