Index: ext/background.js
===================================================================
--- a/ext/background.js
+++ b/ext/background.js
@@ -448,27 +448,27 @@
         if (tabs.length == 0)
           return;
 
         let items = contextMenuItems.get({id: tabs[0].id});
 
         if (!items)
           return;
 
-        items.forEach(item =>
+        for (let item of items)
         {
           browser.contextMenus.create({
             title: item.title,
             contexts: item.contexts,
             onclick(info, tab)
             {
               item.onclick(new Page(tab));
             }
           });
-        });
+        }
       });
     });
   };
 
   let ContextMenus = function(page)
   {
     this._page = page;
   };