Flash player pop up window can not be closed

I work with win10, Mozilla Firefox 55.0 (64-Bit), Adobe Flash Player version 26.0.0.151 is installed.

On various pages - currently on www.armorgames.com - I can’t close the pop up window of the flash player which seems to be not active (white coloured).

Anybody has an idea?

Nachricht geändert durch Michaela Sonnentag