ZoneAlarm Pro delivers strong security features such as a personal "stealth mode" firewall to shield the PC from unauthorized entry, Program Control to prevent Trojan horses and spyware from stealing users' information via unauthorized communications with the Internet, as well as simple set-up for networks, including wireless networks. New in ZoneAlarm Pro 5 are Automatic Program Configuration and Program AlertAdvisor as well as enhanced ease-of-use and further hardening of security.
ZoneAlarm Security Suite is an easy-to-use, comprehensive solution that provides all-in-one PC protection, integrating Zone Labs' award-winning firewall with antivirus, Web site filtering, privacy protection and instant messaging security
Download: ZoneAlarm Pro 5.1.009 Beta | Security Suite 5.1.009 Beta
Screenshot: ZoneAlarm Pro | Security Suite
View: Zone Labs Beta Program
News source: Tech-Critic
ZoneAlarm Security Suite is an easy-to-use, comprehensive solution that provides all-in-one PC protection, integrating Zone Labs' award-winning firewall with antivirus, Web site filtering, privacy protection and instant messaging security
- Fixes since 5.1.001:
- Added help item for proxy configuration setting
- Fixed issue where our clients contacted the dslreports server
- Fixed AOL Browser hang issue
- Fixed beta reported BSOD with Apache Server
- Client will now register with the Microsoft Security Center (Firewall and AV)
- Fixed Visual Studio2002/2003 Hangs with IIS
- Fixed IIS FTP Server issues
- Fixed AV issue on 98SE
What's New
- Fixed Classic Shell settings for Windows 2000.
- Some minor bugs fixed.
- Made some cosmetic changes.

Read comment #3.
That seems like an easy decision to me. In any case, it does work with mozilla/ff like comment #3 said.
version 4 all the way
I have 54 machines running ZoneAlarm Suite 5.x and haven't had any problems.
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