diff -r 000000000000 -r 6474c204b198 browser/components/sessionstore/test/unit/data/sessionstore_invalid.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/sessionstore/test/unit/data/sessionstore_invalid.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,3 @@
+{
+  "windows": // invalid json
+}