When trust certificate dialog pops up, in a webstarted application,
user can not reach this dialog, once he/she makes the dialog
go behind the webstarted application window. Since the dialog is modal,
user neither can reach the dialog nor can interact with his application.
Hence left with no choice than killing the application. For some users,
it will apprear as if the dialog is making their application to hang.
This is applicable only on MS windows.