Merge with BB

boards/static/js/main.js

@@ -136,7 +136,7 b' function processVolumeUser(node) {'
 
 function getHiddenPosts() {
     var arr = Array();
-    var hiddenPosts = localStorage.getItem(ITEM_HIDDEN_POSTS);
+    var hiddenPosts = localStorage && localStorage.getItem(ITEM_HIDDEN_POSTS);
     if (hiddenPosts) {
         arr = JSON.parse(hiddenPosts);
     }
@@ -144,6 +144,7 b' function getHiddenPosts() {'
 }
 
 function processPostHiding(posts) {
+    if (!window.localStorage) return;
     var hiddenPosts = getHiddenPosts();
 
     $.each(posts, function(index) {
@@ -267,7 +268,8 b' function addContextMenu() {'
                         name: gettext('Hide/show'),
                         callback: function(key, opt) {
                             togglePostHidden(postId);
-                        }
+                        },
+                        visible: !!localStorage
                     },
                     edit: {
                         name: gettext('Edit'),