[j_s]

Smells like in-browser cryptocurrency mining! Maybe you should compare notes.

https://news.ycombinator.com/item?id=15528247

https://news.ycombinator.com/item?id=15470244

https://news.ycombinator.com/item?id=15333899

https://news.ycombinator.com/item?id=15270799

https://news.ycombinator.com/item?id=15246145 <- Show:CoinHive

https://news.ycombinator.com/item?id=15124211

(All 40+ comments within the past ~2 months)