Bitminer.io according to the review of badbitcoin.org, a team made up of volunteers wherein anyone can report a site if he/she have been scammed, that this program is listed as a SCAM site. Do not ever try to download the plugin or install the bitminer as it was already reported by some users that it might be a phishing lastpass credentials. It might steal your information if you ignore this warning.

www.Bitminer.io WHOIS Registrar

Domain Handle :
DOM-415321
Domain Name :
bitminer.io ... (Check bitminer.sh)
 ... (Check bitminer.ac)
 Domain Status : Live
 First Registered : 2016-06-05
 Last Updated : 2016-06-25
 Expiry :
2017-06-05 ... Redemption Grace Period Ends, 2017-09-04 00:30
 Back-order : Available
... Purchase a Back-Order
... (What is a back-order?) 
 Domain Owner 
 User ID : NIC-1269522 
 Contact Name : WhoisGuard Protected  Organization Name : WhoisGuard, Inc.  Street : P.O. Box 0823-03411 
 City : Panama 
 State : Panama 
 Postal Code : 00000 
 Country: PA 
 Admin Contact 
 User ID : NIC-1269523

Anyone must have to be very careful in getting in this kind of scheme. The internet nowadays is crowded with scam sites. The strategy is pretty much the same with high-yield investment (HYIP) because for you to earn good amount you have get an upgrade. Be careful guys.