Its always there and was never gone here just i dont use it
as of my Avast Anti Virus dont like it
as of my Avast Anti Virus dont like it
Anti virus doesn't like any mining software. That is to warn you in the case of it being done maliciously without your knowledge. If you are actually trying to mine it is safe to add it to your anti virus exception list.
I think this is generally because it detects a process running in the background and also communicating with a network that is not apparent. In order to hash, your computer has to send and receive information, and the fact that this is done in a background process probably trips warning bells for anti-virus software, since this is how malware programs generally work to spread spam email. Not a computer expert, but I can see parallels there that may be the reason some program prevent your browser from hashing.