Is this kind of mining still profitable?
I advice that you follow what others say here since mining using browser is not profitable at all. It would be more profitable if you will mine using a virtual private server using vps providers like vultr and digital ocean rather than mining with your browser(since you won't consume electricity here).. The downside though is that you will only earn few money, not enough to pay for your droplet (unless you are in a trial period but you will only waste your time earning 3-7$ per month).