Yep. in the testing stage and after that the miner was tested on an subdomain; on every other part of their website was no miner. Since Coinhave exists many creators of content switched or added the coinhive javascript miner which allows to mine the cryptocurrency monero without a seperate programm. But on high load on the processor.

Most sites showed a message and gave the users the option und most times also a guide, to prohibit or disable this specific java script. But others like thepiratebay just added it with neither named to the user nor was it easy to disable (without turning off all JavaScripts)

As administrator of an network with 300 computer workstation all connected up with central antivirus, we had up to 10k Virus warnings in the browser caches.