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
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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.