Using Firefox Version 3.0.10, under Microsoft Windows Vista Home Premium Edition 32-bit, patched as of today.
I open a pdf file, Adobe Reader opens a new window, I can read/print pdf file.
I select "Close" (Red X in upper right hand corner.) nothing happens.
I select "File", select "Exit".
An Adobe Reader message window pops up with "This action cannot be performed from within an external window.".
I select "OK" message window goes away, but Adobe Reader is still there.
I then closed Firefox.
Try to close Adobe Reader again with the same results.
Reboot the system.
Open Firefox, select another web site, open a pdf, read/print pdf file.
Try to close Adobe Reader, same results.
This started after Adobe Reader was updated to version 9.1.1.
It looks like ZoneAlarm Security Suites product Force Field with Virtualization Enabled may have something to do with strange behaviour.
When I just open pdf files that are on the local machine, I don't have a problem, just on remote systems.
I already know ZoneAlarm Support will blame this on Adobe Readers most recent update, since it worked with the previous version of Adobe Reader.