diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/addon-source/browser_dbg_addon4/testxul2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/addon-source/browser_dbg_addon4/testxul2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+// Define something in here or the script may get collected
+window.addEventListener("unload", function() {
+  window.foo = "bar";
+});