This is a very minor problem.
When I close a browser window that is under ForceField, parts of the halo are left on the desktop. They are easy to get rid of but it would be nice if I did not have to mess with them.

Zonealarm Extreme Security
Windows 7 64 bit Pro.
Firefox 4.0.1

I have read forum entries that Firefox 4 does not work with ForceField but it appears to work except for this minor problem.