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diff --git a/toolkit/components/passwordmgr/nsILoginMetaInfo.idl b/toolkit/components/passwordmgr/nsILoginMetaInfo.idl
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+++ b/toolkit/components/passwordmgr/nsILoginMetaInfo.idl
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+/* 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"
+
+[scriptable, uuid(20d8eb40-c494-497f-b2a6-aaa32f807ebd)]
+
+/**
+ * An object containing metainfo for a login stored by the login manager.
+ *
+ * Code using login manager can generally ignore this interface. When adding
+ * logins, default value will be created. When modifying logins, these
+ * properties will be unchanged unless a change is explicitly requested [by
+ * using modifyLogin() with a nsIPropertyBag]. When deleting a login or
+ * comparing logins, these properties are ignored.
+ */
+interface nsILoginMetaInfo : nsISupports {
+  /**
+   * The GUID to uniquely identify the login. This can be any arbitrary
+   * string, but a format as created by nsIUUIDGenerator is recommended.
+   * For example, "{d4e1a1f6-5ea0-40ee-bff5-da57982f21cf}"
+   *
+   * addLogin will generate a random value unless a value is provided.
+   *
+   * addLogin and modifyLogin will throw if the GUID already exists.
+   */
+  attribute AString guid;
+
+  /**
+   * The time, in Unix Epoch milliseconds, when the login was first created.
+   */
+  attribute unsigned long long timeCreated;
+
+  /**
+   * The time, in Unix Epoch milliseconds, when the login was last submitted
+   * in a form or used to begin an HTTP auth session.
+   */
+  attribute unsigned long long timeLastUsed;
+
+  /**
+   * The time, in Unix Epoch milliseconds, when the login was last modified.
+   *
+   * Contrary to what the name may suggest, this attribute takes into account
+   * not only the password but also the username attribute.
+   */
+  attribute unsigned long long timePasswordChanged;
+
+  /**
+   * The number of times the login was submitted in a form or used to begin
+   * an HTTP auth session.
+   */
+  attribute unsigned long timesUsed;
+};