Install "NoCoin", you'll see it frequently when it blocks a miner script.
Usually it's in one of the ads or popups and they show up and disappear again faster than you can file a complaint against them, meaning CMG has no control over that, unless you wanted to request CMG should ban all ads from their site, which is obviously not possible.
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It does not give me anything. Neither on Chrome nor on Opera or Firefox

To CMG admin
You have an injected script digging crypto currencies on the site. Has anyone already told you about it? I would like you to locate him and remove him. I have no intention of digging cryptocurrencies for someone.

Regards

CMG user