My IE browser finally bit the dust lately.

A browser hijacker infiltrated my IE and the problem was so bad I had no choice but to uninstall IE completely off my PC. I also figured that might have been what has caused alot of my problems trying to make the games on this site work. The browser hijacker made everything run slow.
So now I'm looking at installing Firefox. I am aware the newest version doesn't allow ArcadeOX to run. So I've installed a really old version(3.0?) and it was able to download ArcadeOX. Now my problem is when I try opening a game it would cause this version of Firefox to crash and close. I feel I'm getting a little warmer to getting the games back on my PC,but was wondering what's the best old version of Firefox to use to make the games work

?