According to guru's on the ZoneAlarm user forum, Firefox 4 and other new browsers will only be compatible with the new version(s) of ZoneAlarm, when released. See:

• http://forums.zonelabs.com/showthread.php?t=76985&highlight=firefox

You need to update the following plugin:"

• Adobe PDF Plug-In For Firefox and Netscape 8.2.6

1. Check your plugin versions on either of the following links':
   • http://www.mozilla.com/en-US/plugincheck/
   • https://www-trunk.stage.mozilla.com/en-US/plugincheck/
   • Note: plugin check page does not have information on all plugin versions
2. Update Adobe Reader (PDF plugin):
   • From within your existing Adobe Reader (if you have it already installed):
     • Open the Adobe Reader program from your Programs list
     • Click Help > Check for Updates
     • Follow the prompts for updating
     • If this method works for you, skip the "Download complete installer" section below and proceed to "After the installation" below
   • Download complete installer (if you do NOT have Adobe Reader installed):
     • SAVE the installer to your hard drive (save to your Desktop so that you can find it after the download). Exit/Close Firefox. Run the installer you just downloaded.
     • Use either of the links below:
       • https://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox (click on "Installing and updating Adobe Reader")
       • Also see Download link': http://get.adobe.com/reader/otherversions/
   • After the installation, start Firefox and check your version again.

Thank you for answering my question regarding the compatibility of Foxfire 4.0 with Zone Alarm.. For now I will continue using Firefox 3.6.16.

So that other users can find answers that have worked, please take a couple of minutes to return to the forum, sign in and click "Solved" next to my answer Thanks.

I also am a zone alarm user and was not to happy about the issue with 4.0

I use sky .fm for music and was not happy when it would not play. required update to latest flash,which didn't work no matter what. even the suggestion in another thread.

Express your unhappiness with Zone Alarm for not being ready with an update when Firefox 4.0 was first released.

all well and good except sometimes your updates are rather speedy time wise!

I will wait! I liked what I saw of 4.0 so other than the 2 mentioned things above it looked good!