I have an extensive substitution list created on my iMac that is shared with my MacBook Pro, my iPhone and iPad. It's is working as expected in all my applications that I use regularly - EXCEPT for FireFox? I am assuming that there is a config option somewhere that will allow me to turn this on in FireFox - bit I can not find it. Please advise - this is an extremely important usability feature that if not supported will fore me to use another browser - I'm not real keen on that idea!!