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There's a monero one, coinhive, which has browsers mine monero, so the guy earned just 89 cents over a week

https://medium.com/@MaxenceCornet/coinhive-review-embeddable-javascript-crypto-miner-806f7024cde8

Coinhive and Monero isn't ideal for this purpose for plenty of reasons:

  • it's not super efficient to mine with CPU

  • various blockers can and will detect such JS miners (JSECoin is in the process to be whitelisted)

  • it can be misused and exploited in various ways (JSECoin forces opt-in windows)

  • it isn't made exclusively for browser mining

I love Coinhive because I'm a huge fan of Monero but JSECoin seems to be a healthier alternative.

Still not huge bucks but adoption should be started somewhere.