I did some reasearch myself on it weeks ago, I wanted to do a command line miner / wrapper based on the webminer. The problem is it goes through coin-hive so I asked them if they would support that kind of mining, maybe one would gain some 5-10% H/s, but they didn't give me an answer yet. Someone did something for nodejs but didn't test it. So by now it remains a good idea but not enough interesting to justify to make it official by main developers, it seems.
Of course that would be still less profitable than standard old style mining but:
1) browser mining it is quite good in performance, is WebAssembly, not crude javascript, so it has better performance than javascript.
2) one musn't go through the hassle of playing with exchanges and paying stellar withdrawal fees (eg: cryptopia has 0.002 BTC withdrawal fees, it's crazy) to do the deposit/exchange/withdraw
3) you do support the service you're using most, in this case Coinpot. the exchange rate is a bit lower than current market price, but I think it serves to compensate 2)