nsIWebBrowserFocus
 Interface that embedders use for controlling and interacting
 with the browser focus management. The embedded browser can be focused by
 clicking in it or tabbing into it. If the browser is currently focused and
 the embedding application's top level window is disabled, deactivate() must
 be called, and activate() called again when the top level window is
 reactivated for the browser's focus memory to work correctly.

 @status FROZEN
[scriptable, uuid(9c5d3c58-1dd1-11b2-a1c9-f3699284657a)]
interface nsIWebBrowserFocus : nsISupports

Attributes

 The currently focused nsDOMElement when the browser is active,
 or the last focused nsDOMElement when the browser is inactive.
attribute nsIDOMElement focusedElement 
 The currently focused nsDOMWindow when the browser is active,
 or the last focused nsDOMWindow when the browser is inactive.
attribute nsIDOMWindow focusedWindow

Methods

 MANDATORY
 activate() is a mandatory call that must be made to the browser
 when the embedding application's window is activated *and* the 
 browser area was the last thing in focus.  This method can also be called
 if the embedding application wishes to give the browser area focus,
 without affecting the currently focused element within the browser.

 @note
 If you fail to make this call, mozilla focus memory will not work
 correctly.
void activate() 
 MANDATORY
 deactivate() is a mandatory call that must be made to the browser
 when the embedding application's window is deactivated *and* the
 browser area was the last thing in focus.  On non-windows platforms,
 deactivate() should also be called when focus moves from the browser
 to the embedding chrome.

 @note
 If you fail to make this call, mozilla focus memory will not work
 correctly.
void deactivate() 
 Give the first element focus within mozilla
 (i.e. TAB was pressed and focus should enter mozilla)
void setFocusAtFirstElement() 
 Give the last element focus within mozilla
 (i.e. SHIFT-TAB was pressed and focus should enter mozilla)
void setFocusAtLastElement()