I was also encountering problems after the update.
I prefer to use Firefox over other browsers as it appears to be the best browser for support WebGL.
I almost did this, I almost went ahead and reverted to older version.
But... the warning from Mozilla about possible security danger on reverting made me stop.
I tried something else.
I re-installed the flash player/plug-in, even though it was listed as being up-to-date.
And... : )
Problem solved (for me).