diff -r 000000000000 -r 6474c204b198 modules/libjar/zipwriter/test/unit/test_bug467740.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/libjar/zipwriter/test/unit/test_bug467740.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* 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/.
+ */
+
+function run_test()
+{
+  // In this test we try to open some files that aren't archives:
+  //  - An empty file, that is certainly not an archive.
+  //  - A file that couldn't be mistaken for archive, since it is too small.
+  //  - A file that could be mistaken for archive, if we checked only the file
+  //     size, but is invalid since it contains no ZIP signature.
+  var invalidArchives = ["emptyfile.txt", "smallfile.txt", "test.png"];
+
+  invalidArchives.forEach(function(invalidArchive) {
+    // Get a reference to the invalid file
+    var invalidFile = do_get_file(DATA_DIR + invalidArchive);
+
+    // Opening the invalid file should fail (but not crash)
+    try {
+      zipW.open(invalidFile, PR_RDWR);
+      do_throw("Should have thrown NS_ERROR_FILE_CORRUPTED on " +
+               invalidArchive + " !");
+    } catch (e if (e instanceof Ci.nsIException &&
+                   e.result == Components.results.NS_ERROR_FILE_CORRUPTED)) {
+      // do nothing
+    }
+  });
+}