247 Games Issue

24x7 games claim they use Flash. I have installed and enabled Flash in Firefox (which is a requirement now). Here is the sys info and issue:

Operating system & version: CentOS 7, 3.10.0-957.1.3.el7.x86_64 GNU/Linux

Browser(s) & version: Firefox Quantum, Extended Support Release 60.4.0esr (64bit)

Flash Player version: 32.0.0.114

Problem:

I go to 247 Games (ex: http://www.247sudoku.com/) all appears to be fine. I the game. A page appears; however, there is an error message at the bottom: Sorry! There was an Error. Press here to try again”

And it refreshes to the same error message screen.