use localstorage even when gm api present

4chan_x.user.js

@@ -446,6 +446,7 @@
       },
       setValue: function(name, value) {
         name = NAMESPACE + name;
+        localStorage[name] = JSON.stringify(value);
         return GM_setValue(name, JSON.stringify(value));
       }
     });

script.coffee

@@ -306,6 +306,8 @@ if GM_deleteValue?
       GM_openInTab url
     setValue: (name, value) ->
       name = NAMESPACE + name
+      # for `storage` events
+      localStorage[name] = JSON.stringify value
       GM_setValue name, JSON.stringify value
 else
   $.extend $,