title: Remove close button for Firefox SDK-toolbar
body: <p>I would like to know how to style a Firefox addon toolbar using the SDK. For example, a toolbar will have a 3d-border around it with a close button on the right. How can I remove/modify this?</p>
  
  <p>here's an <a href="http://i.imgur.com/aAZihj3.png" rel="nofollow">image</a></p>