If only the people who are using this script would ask their users. But this script was intentionally designed to work in the background without people noticing it. And right now, I see no way of effectively blocking it. Banning the bitp.it domain is not enough, because people can easily copy and modify the script and host it on their website. Turning off JS completely renders most of the websites useless.

This shit isn't even a good idea from a technological standpoint, because 1bitc0inplz just figured out a way to waste even more cpu time (doing calculations with JS instead of native code, seriously?)

I have to agree with Nick here. This idea is pure bullshit. Not only do you waste the energy of YOUR users for YOUR benefit without their consent. You are also draining the batteries of notebooks and smartphones, potentially leading to a shorter battery life. Are you willing to pay for that? And I don't want an Internet where every website has 100% cpu usage and causes my cpu cooler to speed up. We've already got flash for that.