diff -r 000000000000 -r 6474c204b198 dom/plugins/test/unit/test_bug455213.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/plugins/test/unit/test_bug455213.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,90 @@
+/* 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/.
+ */
+
+Components.utils.import("resource://gre/modules/Services.jsm");
+
+// Plugin registry uses different field delimeters on different platforms
+var DELIM = ":";
+if ("@mozilla.org/windows-registry-key;1" in Components.classes)
+  DELIM = "|";
+
+var gProfD = do_get_profile_startup();
+var gDirSvc = Cc["@mozilla.org/file/directory_service;1"].
+             getService(Ci.nsIProperties);
+
+// Writes out some plugin registry to the profile
+function write_registry(version, info) {
+  var header = "Generated File. Do not edit.\n\n";
+  header += "[HEADER]\n";
+  header += "Version" + DELIM + version + DELIM + "$\n\n";
+  header += "[PLUGINS]\n";
+
+  var registry = gProfD.clone();
+  registry.append("pluginreg.dat");
+  var foStream = Components.classes["@mozilla.org/network/file-output-stream;1"]
+                           .createInstance(Components.interfaces.nsIFileOutputStream);
+  // write, create, truncate
+  foStream.init(registry, 0x02 | 0x08 | 0x20, 0666, 0);
+
+  var charset = "UTF-8"; // Can be any character encoding name that Mozilla supports
+  var os = Cc["@mozilla.org/intl/converter-output-stream;1"].
+           createInstance(Ci.nsIConverterOutputStream);
+  os.init(foStream, charset, 0, 0x0000);
+
+  os.writeString(header);
+  os.writeString(info);
+  os.close();
+}
+
+function run_test() {
+  var plugin = get_test_plugintag();
+  do_check_true(plugin == null);
+
+  var file = get_test_plugin();
+  if (!file)
+    do_throw("Plugin library not found");
+
+  // Write out a 0.9 version registry that marks the test plugin as disabled
+  var registry = "";
+  if (gIsOSX) {
+    registry += file.leafName + DELIM + "$\n";
+    registry += file.path + DELIM + "$\n";
+  } else {
+    registry += file.path + DELIM + "$\n";
+    registry += DELIM + "$\n";
+  }
+  registry += file.lastModifiedTime + DELIM + "0" + DELIM + "0" + DELIM + "$\n";
+  registry += "Plug-in for testing purposes.\u2122 " + 
+                "(\u0939\u093f\u0928\u094d\u0926\u0940 " + 
+                "\u4e2d\u6587 " +
+                "\u0627\u0644\u0639\u0631\u0628\u064a\u0629)" +
+                DELIM + "$\n";
+  registry += "Test Plug-in" + DELIM + "$\n";
+  registry += "1\n";
+  registry += "0" + DELIM + "application/x-test" + DELIM + "Test mimetype" +
+              DELIM + "tst" + DELIM + "$\n";
+  write_registry("0.9", registry);
+
+  // Initialise profile folder
+  do_get_profile();
+
+  plugin = get_test_plugintag();
+  if (!plugin)
+    do_throw("Plugin tag not found");
+
+  // If the plugin was not rescanned then this version will not be correct
+  do_check_eq(plugin.version, "1.0.0.0");
+  do_check_eq(plugin.description,
+              "Plug-in for testing purposes.\u2122 " + 
+                "(\u0939\u093f\u0928\u094d\u0926\u0940 " + 
+                "\u4e2d\u6587 " +
+                "\u0627\u0644\u0639\u0631\u0628\u064a\u0629)");
+  // If the plugin registry was not read then the plugin will not be disabled
+  do_check_true(plugin.disabled);
+  do_check_false(plugin.blocklisted);
+
+  // Clean up
+  Services.prefs.clearUserPref("plugin.importedState");
+}