Using firefox quantum 61.01.
When this addon is activated I notice
continued outbound connection attempts
to coinhive.com. Coinhive is a Trojan Data Miner
that severely compromises your compuer.
When this addon is deactivated the connection attempts
stop. Draw your own conclusions but the addon does not
function with Firefox Quantum other than to attempt
this connection. Google coinhive.com for further details.