Most worryingly however is the memory leak associated with Google Toolbar. The number of buttons you can add is a bit overwhelming in fact and can soon leave Firefox looking bloated and cluttered. Other add-ons you may choose to select or deselect is a pagerank tool. You can even check your Gmail via the toolbar without having to open your inbox within Firefox. Other features include a multi-language spell check, Google search box and a built-in auto-filler for forms and other fields.