Returns the XUL controllers of the chrome window.
XUL-specific. Not part of specification.
By default, a window's controller contains the code that supports the global window commands.
Chrome code can add controllers (to be used in conjunction with the goDoCommand and goUpdateCommand functions in globalOverlay.js).
However, the added controllers must be explicitly removed when the window is unloaded, as this is not done automatically.
Each missing removal can causebug 415775:
ASSERTION: XPConnect is being called on a scope without a 'Components' property!