You can easily earn extra income simply by using your internet browser. It is called CryptoTab Browser. You can set it to mine BTC at different levels of processing power depending on your computing needs for each particular device.. You can share your referral code which will exponentially increase your earning potential!
There is a 10 lvl referral system which can equal out to roughly 9 million users whose earnings you will get a percentage of! The referrals are seperated into levels. Each level branches further out. The first level of referrals (those referred by you personally) will pay the greatest percentage of their total earnings to you.
Needless to say, you want to refer the most active and enthusiastic people first. They ,in turn, refer others who are hopefully busy sharing their link. The percentages paid to you decrease the further down the levels they go.
Either way, 9 million users each paying you a small percentage of what they mine is a huge amount of money! Bitcoin is teetering around 40-50k consistently. The only thing you need to do is open one browser window and turn on mining. You dont even need to use it as your default browser if you dont want to. CryptoTab Browser is available for Android and IOS. It works on mobile, tablet, and desktop!