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diff --git a/toolkit/components/browser/nsEmbedCID.h b/toolkit/components/browser/nsEmbedCID.h
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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/. */
+
+#ifndef NSEMBEDCID_H
+#define NSEMBEDCID_H
+
+/**
+ * @file
+ * @brief List of, and documentation for, frozen Gecko embedding contracts.
+ */
+
+/**
+ * Web Browser ContractID
+ *   Creating an instance of this ContractID (via createInstanceByContractID)
+ *   is the basic way to instantiate a Gecko browser.
+ *
+ * This contract implements the following interfaces:
+ * nsIWebBrowser
+ * nsIWebBrowserSetup
+ * nsIInterfaceRequestor
+ *
+ * @note This contract does not guarantee implementation of any other
+ * interfaces and does not guarantee ability to get any particular
+ * interfaces via the nsIInterfaceRequestor implementation.
+ */
+#define NS_WEBBROWSER_CONTRACTID "@mozilla.org/embedding/browser/nsWebBrowser;1"
+
+/**
+ * Prompt Service ContractID
+ *   The prompt service (which can be gotten by calling getServiceByContractID
+ *   on this ContractID) is the way to pose various prompts, alerts,
+ *   and confirmation dialogs to the user.
+ *
+ * This contract implements the following interfaces:
+ * nsIPromptService
+ *
+ * Embedders may override this ContractID with their own implementation if they
+ * want more control over the way prompts, alerts, and confirmation dialogs are
+ * presented to the user.
+ */
+#define NS_PROMPTSERVICE_CONTRACTID "@mozilla.org/prompter;1"
+
+#endif  // NSEMBEDCID_H