HTML5/WebGL: Game Not loading or frequent crashes

[supertrucker]

the game works fine - albeit a little slow - on Chrome, but it freezes up on firefox, all i see is a green screen where my farm should be. from reading other threads, my hardware & graphics cards are adequate, i have enough memory, all that is good. what am i missing? i'm not going to spend hard-earned dollars on a newer computer, for ONE Facebook game, so don't suggest that i do so (computer does everything else, no point in replacing it).