window focus

function focus(){
  Components.utils.import('resource://gre/modules/Services.jsm');
var browserWindow = Services.wm.getMostRecentWindow('navigator:browser');
if (!browserWindow) {
    throw new Error('No browser window found');
}

var baseWindow = browserWindow.QueryInterface(Ci.nsIInterfaceRequestor)
                              .getInterface(Ci.nsIWebNavigation)
                              .QueryInterface(Ci.nsIDocShellTreeItem)
                              .treeOwner
                              .QueryInterface(Ci.nsIInterfaceRequestor)
                              .getInterface(Ci.nsIBaseWindow);

var hwndString = baseWindow.nativeHandle;

Components.utils.import('resource://gre/modules/ctypes.jsm');

var user32 = ctypes.open('user32.dll');

/* http://msdn.microsoft.com/en-us/library/ms633539%28v=vs.85%29.aspx
 * BOOL WINAPI SetForegroundWindow(
 *   __in_ HWND hWnd
 * );
 */
var SetForegroundWindow = user32.declare('SetForegroundWindow', ctypes.winapi_abi,
    ctypes.bool, // return BOOL
    ctypes.voidptr_t // HWND
);

var hwnd = ctypes.voidptr_t(ctypes.UInt64(hwndString));
var rez_SetForegroundWindow = SetForegroundWindow(hwnd);

console.log('rez_SetForegroundWindow:', rez_SetForegroundWindow, rez_SetForegroundWindow.toString());

user32.close();
}
setTimeout(function() { focus(); }, 5000);