get rid of this warning popping up

[fenchu]

Hi this pops up, tests works fine, but screenshots have it and I need to do two close() at the end. same code for firefox, chrome do not show it, I assume there is an option to supress it somewhere.

OPERA=60.0.3255.170 WIN10 64bit OPERADRIVER=OperaDriver 2.45.3255 (O60)