This exposes a fundamental flaw in the internet advertising model. On some level I've known that a script like this could be easily written for a long time, but

This exposes a fundamental flaw in the internet advertising model. On some level I've known that a script like this could be easily written for a long time, but seeing this working product really made it clear. It's unlikely that millions of people would use something like this, but if they did it would be chaos in the advertising industry. They love online ads because it allows them to gather empirical metrics that can't be gathered from television or radio. It's impossible to know objectively what kind of an impression a tv made, but you can see exactly how many people clicked on a banner. But this could also be a fatal flaw. If a lot of people wanted to, they could destroy payperclick advertising. It would be almost impossible to know which clicks were real and which were fake. Companies would lose a lot of faith in the industry because an update to the script could play havoc with the online ad budget of this company or that on a whim. I don't know why anyone would chose the attack the online advertising industry and it wouldn't be a good idea, but it's interesting to that it's possible. Online ads is a huge market space but also one could also be severely disrupted by a greasemonkey script. They'd better be careful not cross the line with tracking and privacy invasion because this is one of the rare cases where people can take direct action to fight back.