I was using Beta which was utter rubbish but now FF 44.0 is pretty good.

Chrome is simply far too draconian. Not so good is the FF 485 score at https://html5test.com. Chrome 44 is a good bit closer to the current full HTML 5 test compatibility score of 555.

It seems fast to me on my slow tablet but this is interesting (link from the fishtank thread)
https://dev.windows.com/en-us/micros...os/fishietank/

There FF is smooth but slower yet on my Chrome, 50fps speed is maintained via massive yet ugly frame skip