Well, lets start...
There are plenty of crypto coins online but they come up with a way to mine using your browser and this coin was called "Monero". Monero has been discontinued as it was having a very high hash rate to convert and that make it very difficult for a normal computer.
I recommend you to register and start mining with JSEcoin
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In the dashboard collect your JavaScript code and implement in the forum. The more user you have here in the forum and for a long period of time the more you will earn.