@ escrow.ms
Malware scan does not helps in every case as virus/trojan could be "FUD"(Fully undetectable).
Do you have java on your pc, or visited any suspicious site /downloaded some app recently ?
Install a firewall and check incoming/outgoing connections.
Java is disabled in firefox
Yes, I am checking incoming and outgoing connections now.
I did notice that inside Firfore Options>Network Blockchain.info is listed as
'allowed to store data for offline use'I've removed that listing, no idea if Blockchain put it there or a hack of some kind.