This method allows you to inhibit the receipt of events from other window objects that might have been loaded from a server other than the one that provided the script it is called from. You need higher than normal privilege to execute this method. However this method itself is quote harmless, the one that really requires the security interlocking is the window.enableExternalCapture() method.

Warnings:

• Although this method can be called without any special privilege being necessary, your script will need to be granted the UniversalBrowserWrite privilege to enable the external capture again.