ZoneAlarm security toolbar and ForceField version 9.x and below are not compatible with Firefox 4 and IE 9
We are currently in beta with a new version which will be compatible once its been release to the public.
The ETA when ZA 10 will be released is June 7, 2011.
You can test the compatibility of Firefox 4 and IE 9 with the latest Extreme 10 version which is compatible with FireFox 4 and IE9.
Forcefield will be compatible with IE9 and Firefox 4 after ZoneAlarm 10 is released to the publicn June 7th.
At this time those browsers are not supported in version 9.x.