Additional download dialog is blocking all sessions of MZ/FF
Tested OS : XP
Tested Bundle : 6U5 b3 (promoted build)
Steps to reproduce:
1. Install kernel JRE bundle
2. In one session of MZ, open some document
3. Launch any applet in another session of MZ
Addition download dialog will be launched. During download of the bundles, it is not possible to look into the first session of MZ.
It is working fine with IE.

Expected behavior :
All sessions of MZ should not be blocked by additional download dialog
 
Image file attached