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diff --git a/toolkit/components/commandlines/nsICommandLineHandler.idl b/toolkit/components/commandlines/nsICommandLineHandler.idl
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+++ b/toolkit/components/commandlines/nsICommandLineHandler.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"
+
+interface nsICommandLine;
+
+/**
+ * Handles arguments on the command line of an XUL application.
+ *
+ * Each handler is registered in the category "command-line-handler".
+ * The entries in this category are read in alphabetical order, and each
+ * category value is treated as a service contractid implementing this
+ * interface.
+ *
+ * By convention, handler with ordinary priority should begin with "m".
+ *
+ * Example:
+ * Category             Entry          Value
+ * command-line-handler c-extensions   @mozilla.org/extension-manager/clh;1
+ * command-line-handler m-edit         @mozilla.org/composer/clh;1
+ * command-line-handler m-irc          @mozilla.org/chatzilla/clh;1
+ * command-line-handler y-final        @mozilla.org/browser/clh-final;1
+ *
+ * @note What do we do about localizing helpInfo? Do we make each handler do it,
+ *       or provide a generic solution of some sort? Don't freeze this interface
+ *       without thinking about this!
+ */
+
+[scriptable, uuid(d4b123df-51ee-48b1-a663-002180e60d3b)]
+interface nsICommandLineHandler : nsISupports
+{
+  /**
+   * Process a command line. If this handler finds arguments that it
+   * understands, it should perform the appropriate actions (such as opening
+   * a window), and remove the arguments from the command-line array.
+   *
+   * @throw NS_ERROR_ABORT to immediately cease command-line handling
+   *        (if this is STATE_INITIAL_LAUNCH, quits the app).
+   *        All other exceptions are silently ignored.
+   */
+  void handle(in nsICommandLine aCommandLine);
+
+  /**
+   * When the app is launched with the --help argument, this attribute
+   * is retrieved and displayed to the user (on stdout). The text should
+   * have embedded newlines which wrap at 76 columns, and should include
+   * a newline at the end. By convention, the right column which contains flag
+   * descriptions begins at the 24th character.
+   */
+  readonly attribute AUTF8String helpInfo;
+};