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diff --git a/dom/ipc/nsIHangReport.idl b/dom/ipc/nsIHangReport.idl
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+++ b/dom/ipc/nsIHangReport.idl
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+
+#include "nsISupports.idl"
+
+webidl FrameLoader;
+webidl Element;
+
+/**
+ * When a content process hangs, Gecko notifies "process-hang-report" observers
+ * and passes an nsIHangReport for the subject parameter. There is at most one
+ * nsIHangReport associated with a given content process. As long as the content
+ * process stays stuck, the "process-hang-report" observer will continue to be
+ * notified at regular intervals (approximately once per second). The content
+ * process will continue to run uninhibitedly during this time.
+ */
+
+[scriptable, uuid(5fcffbb9-be62-49b1-b8a1-36e820787a74)]
+interface nsIHangReport : nsISupports
+{
+  readonly attribute Element scriptBrowser;
+  readonly attribute ACString scriptFileName;
+  // Duration of the hang so far.
+  readonly attribute double hangDuration;
+  readonly attribute AString addonId;
+
+  // The child id of the process in which the hang happened.
+  readonly attribute unsigned long long childID;
+
+  // Called by front end code when user ignores or cancels
+  // the notification.
+  void userCanceled();
+
+  // Terminate the slow script if it is still running.
+  void terminateScript();
+
+  // Ask the content process to start up the slow script debugger.
+  void beginStartingDebugger();
+
+  // Inform the content process that the slow script debugger has finished
+  // spinning up. The content process will run a nested event loop until this
+  // method is called.
+  void endStartingDebugger();
+
+  // Inquire whether the report is for a content process loaded by the given
+  // frameloader, or any descendents in its BrowsingContext tree.
+  bool isReportForBrowserOrChildren(in FrameLoader aFrameLoader);
+};