Fasterfox issue ?

There is allot of software that works like this not just Fasterfox, which will follow all links from a page and cache all files for faster browsing, and it use to be very common back in the old dial-up internet access days.

However, with most people being on broadband these days this type of software isn't needed anymore, so few people will use it, so I can't see it being much of a problem.

Also, trying to prevent such software would be a very difficult task and more likely soothing done at web server level rather than at the client server app level, like web wiz forums.