Hi rhinopower, welcome to the forums.
On my mac i eventually switched from running FOE on safari, to using Chrome - but i find that i need to clear my browser history every couple of hours or the whole thing clogs up, eventually leading to shockwave crash. I have HA switched off at the moment but it really doesn't seem to matter whether it is on or off.
Are there any Mac users out there who do find the game runs satisfactorily on a Mac? if so, please let us know what works best for you.
thanks
Jampots