diff -r 000000000000 -r 6474c204b198 dom/tests/mochitest/ajax/offline/missingFile.cacheManifest
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/tests/mochitest/ajax/offline/missingFile.cacheManifest	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+CACHE MANIFEST
+http://mochi.test:8888/tests/SimpleTest/SimpleTest.js
+http://mochi.test:8888/tests/dom/tests/mochitest/ajax/offline/offlineTests.js
+
+# The following item doesn't exist, and will cause an update error.
+http://mochi.test:8888/tests/dom/tests/mochitest/ajax/offline/doesntExist.html