diff -r 000000000000 -r 6474c204b198 xpcom/base/nsIDebug.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/base/nsIDebug.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,64 @@
+/* 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"
+
+/**
+ *   For use by consumers in scripted languages (JavaScript, Java, Python,
+ *   Perl, ...).
+ *
+ * @note C/C++ consumers who are planning to use the nsIDebug interface with
+ *   the "@mozilla.org/xpcom;1" contract should use NS_DebugBreak from xpcom
+ *   glue instead.
+ *
+ */
+
+[scriptable, uuid(3bf0c3d7-3bd9-4cf2-a971-33572c503e1e)]
+interface nsIDebug : nsISupports
+{
+  /**
+   * Show an assertion and trigger nsIDebug.break().
+   *
+   * @param aStr assertion message
+   * @param aExpr expression that failed
+   * @param aFile file containing assertion
+   * @param aLine line number of assertion
+   *
+   */
+  void assertion(in string aStr,
+                 in string aExpr,
+                 in string aFile, 
+                 in long aLine);
+
+  /**
+   * Show a warning.
+   *
+   * @param aStr warning message
+   * @param aFile file containing assertion
+   * @param aLine line number of assertion
+   */
+  void warning(in string aStr,
+               in string aFile,
+               in long aLine);
+
+  /**
+   * Request to break into a debugger.
+   *
+   * @param aFile file containing break request
+   * @param aLine line number of break request
+   */
+  void break(in string aFile, 
+             in long aLine);
+
+  /**
+   * Request the process to trigger a fatal abort.
+   *
+   * @param aFile file containing abort request
+   * @param aLine line number of abort request
+   */
+  void abort(in string aFile, 
+             in long aLine);
+};
+