Sniffs your local pc to look for remote desktop and vnc ports on it. I can see this being useful in finding RAT risks, but the portscan thing is something the browser should be blocking or sandboxing.
As for PayPal, well, your cc / bank also shares lots of data.
If your threat modelling is that severe, your best bet is Tor Craigslist, a couple blokes packing heat and a briefcase of money in a place with no parking lot surveillance.
But then at that point security and safety is on you and your mates to implement.