Flash Graphics Won't Resize

[Eftelibra]

I play MyBrute and Pale Moon is brilliant for playing as it is now the only browser which will work with MyBrute Greasemonkey Scripts.

The only problem is that the flash graphics won't resize to bigger than 100% as they will in Chrome based browsers. As I am using a Surface Pro 3, that is a problem as the graphics are too small to see properly.

I have dug around in the settings but can't find any way to resize the flash graphics. The text goes bigger and smaller, but the graphics stay the same. Is there any way I can fix this problem? Thanks.