IE vs. FireFox 系列 - showModalDialog

IE vs. FireFox 系列 - showModalDialog
window.open - MDC

modal
Note: Starting with Mozilla 1.2.1, this feature requires the UniversalBrowserWrite privilege ( bug 180048 ). Without this privilege, it is ignored.
If set to yes, the new window is said to be modal. The user cannot return to the main window until the modal window is closed. A typical modal window is created by the alert() function.
The exact behavior of modal windows depends on the platform and on the Mozilla release version.