so this is a google chrome extension CryptoTab for bitcoin you can set it on low medium or high processing power
i get 35 to 40h/sec made about 58 cents so far. if just using it when online in background not greatest earner unless in a poor country i made about 50 something cents but i guess if you add referrals it would make it pay.
here is my referral https://getcryptotab.com/61441