I have accidentally found inside Firefox process properties (using Process Explorer) a weird connection in tcp/ip tab:
bandicam.com:some_ports
it points at localhost 127.0.0.1:some_ports
bandicam is desktop recording software that I had installed year ago.
I can't find in web any information of that connection, and I have feeling that it is not native for Mozilla
I had also disabled all addons, the problem didn't go away.
Do you have any clue?