Hi, my friend.
Today I show you a free BTC miner. It is Cryptotab. However, You have to use google chome.
You can earn more btc by using referral system
https://getcryptotab.com/609543
Please, Follow this link https://getcryptotab.com/609543
They say :
Google Chrome must be opened to mine Bitcoin. However, you can close this extension window and you will continue to be mining. To save your BTC and list of referrers you need to sign in.