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diff --git a/toolkit/components/commandlines/nsICommandLineValidator.idl b/toolkit/components/commandlines/nsICommandLineValidator.idl
new file mode 100644
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+++ b/toolkit/components/commandlines/nsICommandLineValidator.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;
+
+/**
+ * Validates arguments on the command line of an XUL application.
+ *
+ * Each validator is registered in the category "command-line-validator".
+ * 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, validator with ordinary priority should begin with "m".
+ *
+ * Example:
+ * Category               Entry          Value
+ * command-line-validator b-browser      @mozilla.org/browser/clh;1
+ * command-line-validator m-edit         @mozilla.org/composer/clh;1
+ * command-line-validator m-irc          @mozilla.org/chatzilla/clh;1
+ *
+ */
+
+[scriptable, uuid(5ecaa593-7660-4a3a-957a-92d5770671c7)]
+interface nsICommandLineValidator : nsISupports
+{
+  /**
+   * Process the command-line validators in the proper order, calling
+   * "validate()" on each.
+   *
+   * @throws NS_ERROR_ABORT if any validator throws NS_ERROR_ABORT. All other
+   *         errors thrown by validators will be silently ignored.
+   */
+  void validate(in nsICommandLine aCommandLine);
+};