CryptoTab Browser allows you to use your computers processing power to mine small amounts of BTC just by having the browser window open. You get the most power out of the PC version. Not much on mobile but it does give a small boost to your network. Every device you have logged in to the same account adds to your hash rate, therefore, increasing your payout. You can also earn a percentage of any referrals income. 

Here I have the app open on my iPhone. The remote mining speed is my PC running. I currently earn about 5¢ a day without any referrals and just the PC having the browser open. I don’t have a real expensive PC either. It was built moderately and for office use, not gaming. Referrals can really add up. Start or expand your crypto journey with CryptoTab Browser!