diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/code_blackboxing_blackboxme.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/code_blackboxing_blackboxme.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+function blackboxme(fn) {
+  (function one() {
+    (function two() {
+      (function three() {
+        fn();
+      }());
+    }());
+  }());
+}