flash issues in Firefox only

I have Flash Player installed via the adobe-flashplugin, which installs the regular adobeflashplugin and the pepperflashplugin.

On Firefox, when I tried to play one of the flash games I tend to play, the sounds of the game is heard, but there's no flash animation, the box where the flash animation is suppose to appear, appears invisible, and also, when I went to www.adobe.com/software/flash/about/, the area where it's suppose to tell you what version of Flash is ruing is invisible.

However, when I tried it on Chromium, Flash player works, my game works, animation and audio, the Adobe Flash about page tells me which version of Flash is being used by Chromium.

So the problems seems to be with Firefox. I've tried refreshing Firefox and I've tried reinstalling adobe-flashplugin, but still, Flash doesn't want to work on Firefox.

Please see attached image.

Screenshots.jpg