Linux Mac OSX Windows 
 The nsIEmbeddingSiteWindow is implemented by the embedder to provide
 Gecko with the means to call up to the host to perform basic windowing
 operations such as resizing and showing.

 Changes from version 1 to version 2:
 A new method: blur()
[scriptable, uuid(e932bf55-0a64-4beb-923a-1f32d3661044)]
interface nsIEmbeddingSiteWindow2 : nsIEmbeddingSiteWindow

Methods

 Blur the window. This should unfocus the window and send an onblur event.
void blur()