One thing I always liked about coins like JSEcoin is that they are actively communicating with the makers of web browsers, antivirus programs, etc., to prove that they are not malicious. For example, JSEcoin; it would be very hard for some criminal to hide JSEcoin in a web page, because, the way it is designed, there's always a big ol' JSEcoin logo at the bottom of the page! With that clear logo, no criminal will get very far, because the victims will see the big ol' logo on the bottom that you have to click past! In other words, it's too transparent for any malicious intent to be effective. So that's why I like these browser-mine-specific coins better than Cryptonight miners. Especially since JSEcoin is actually talking with these security people and browser manufacturers to prove that they are better than a Cryptonight miner; that was always amazing to me.