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diff --git a/embedding/nsIWindowCreator2.idl b/embedding/nsIWindowCreator2.idl
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+++ b/embedding/nsIWindowCreator2.idl
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * nsIWindowCreator2 is an extension of nsIWindowCreator which allows
+ * additional information about the context of the window creation to
+ * be passed.
+ *
+ * @see nsIWindowCreator
+ * @see nsIWindowWatcher
+ *
+ * @status
+ */
+
+#include "nsIWindowCreator.idl"
+
+interface nsITabParent;
+interface nsIURI;
+interface nsIWebBrowserChrome;
+interface mozIDOMWindowProxy;
+
+[scriptable, uuid(b6c44689-f97e-4f32-a723-29eeddfbdc53)]
+
+interface nsIWindowCreator2 : nsIWindowCreator {
+
+  /**
+   * Definitions for contextFlags
+   */
+
+  // Likely that the window is an advertising popup. 
+  const unsigned long PARENT_IS_LOADING_OR_RUNNING_TIMEOUT = 0x00000001;
+
+  /** Create a new window. Gecko will/may call this method, if made
+      available to it, to create new windows.
+      @param parent Parent window, if any. Null if not. The newly created
+                    window should be made a child/dependent window of
+                    the parent, if any (and if the concept applies
+                    to the underlying OS).
+      @param chromeFlags Chrome features from nsIWebBrowserChrome
+      @param contextFlags Flags about the context of the window being created.
+      @param aOpeningTab The TabParent that is trying to open this new chrome
+                         window. Can be nullptr.
+      @param aOpener The window which is trying to open this new chrome window.
+                     Can be nullptr
+      @param cancel Return |true| to reject window creation. If true the
+                    implementation has determined the window should not
+                    be created at all. The caller should not default
+                    to any possible backup scheme for creating the window.
+      @return the new window. Will be null if canceled or an error occurred.
+  */
+  nsIWebBrowserChrome createChromeWindow2(in nsIWebBrowserChrome parent,
+                                          in uint32_t chromeFlags,
+                                          in uint32_t contextFlags,
+                                          in nsITabParent aOpeningTab,
+                                          in mozIDOMWindowProxy aOpener,
+                                          out boolean cancel);
+
+  /**
+   * B2G multi-screen support. When open another top-level window on b2g,
+   * a screen ID is needed for identifying which screen this window is
+   * opened to.
+   * @param aScreenId Differentiate screens of windows. It is platform-
+   *                  specific due to the hardware limitation for now.
+   */
+  [noscript]
+  void setScreenId(in uint32_t aScreenId);
+};