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mining is automatic and does not require any permission, The only thing you do is don't close your browser while you are doing your mining. About how many cores it will use, am not sure of that but when you visit their mining site, you shall find your current hashrate calculated and how long it would take to mine a block. 1block = 50 Nimiq.Yes, according to their website, https://nimiq.com/betanet/

visit their website
https://nimiq.com/betanet/

you shall find out your hashrate. Thanks

wow, thank you! I just read it is a node.js, will try it now

you are welcome