ZoneAlarm Security Suite version 10.0.250.000 supposedly fixed the Firefox 5 incompatibility problems. It didn't fix all of them.
1. When multiple Firefox windows are open, ZA changes the foreground-to-background order of the background windows when a new window is chosen as foreground.
2. The ZA toolbar is not (always) displayed. This doesn't bother me since I don't want it displayed, but I think I should have the option.
I have not yet reported these problems. I'll do that when I can afford to waste hours on the chat line. (How do we report problems via email?)