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diff --git a/editor/txmgr/nsITransaction.idl b/editor/txmgr/nsITransaction.idl
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+++ b/editor/txmgr/nsITransaction.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/. */
+
+#include "nsISupports.idl"
+
+/*
+ * The nsITransaction interface.
+ * <P>
+ * This interface is implemented by an object that needs to
+ * execute some behavior that must be tracked by the transaction manager.
+ */
+[scriptable, uuid(58e330c1-7b48-11d2-98b9-00805f297d89)]
+interface nsITransaction : nsISupports
+{
+  /**
+   * Executes the transaction.
+   */
+  void doTransaction();
+
+  /**
+   * Restores the state to what it was before the transaction was executed.
+   */
+  void undoTransaction();
+
+  /**
+   * Executes the transaction again. Can only be called on a transaction that
+   * was previously undone.
+   * <P>
+   * In most cases, the redoTransaction() method will actually call the
+   * doTransaction() method to execute the transaction again.
+   */
+  void redoTransaction();
+
+  /**
+   * The transaction's transient state. This attribute is checked by
+   * the transaction manager after the transaction's Execute() method is called.
+   * If the transient state is false, a reference to the transaction is
+   * held by the transaction manager so that the transactions' undoTransaction()
+   * and redoTransaction() methods can be called. If the transient state is
+   * true, the transaction manager returns immediately after the transaction's
+   * doTransaction() method is called, no references to the transaction are
+   * maintained. Transient transactions cannot be undone or redone by the
+   * transaction manager.
+   */
+  readonly attribute boolean isTransient;
+
+  /**
+   * Attempts to merge a transaction into "this" transaction. Both transactions
+   * must be in their undo state, doTransaction() methods already called. The
+   * transaction manager calls this method to coalesce a new transaction with
+   * the transaction on the top of the undo stack.
+   * This method returns a boolean value that indicates the merge result.
+   * A true value indicates that the transactions were merged successfully,
+   * a false value if the merge was not possible or failed. If true,
+   * the transaction manager will Release() the new transacton instead of
+   * pushing it on the undo stack.
+   * @param aTransaction the previously executed transaction to merge.
+   */
+  boolean merge(in nsITransaction aTransaction);
+};
+