diff -r 000000000000 -r 6474c204b198 toolkit/mozapps/extensions/test/browser/browser_bug679604.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/mozapps/extensions/test/browser/browser_bug679604.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,31 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// Bug 679604 - Test that a XUL persisted category from an older version of
+// Firefox doesn't break the add-ons manager when that category doesn't exist
+
+const PREF_UI_LASTCATEGORY = "extensions.ui.lastCategory";
+
+var gManagerWindow;
+
+function test() {
+  waitForExplicitFinish();
+
+  open_manager(null, function(aWindow) {
+    var categories = aWindow.document.getElementById("categories");
+    categories.setAttribute("last-selected", "foo");
+    aWindow.document.persist("categories", "last-selected");
+
+    close_manager(aWindow, function() {
+      Services.prefs.clearUserPref(PREF_UI_LASTCATEGORY);
+
+      open_manager(null, function(aWindow) {
+        is(new CategoryUtilities(aWindow).selectedCategory, "discover",
+           "Should have loaded the right view");
+
+        close_manager(aWindow, finish);
+      });
+    });
+  });
+}