title: GeckoFX showing error when disposing
body: <p>I am using GeckoFX 13 for my desktop application. So I have a main form which is opening another form with GeckoWebBrowser when required. I am using another Gecko browser into my main form also. Everything is working fine except when I am closing the application its showing this error </p>
  
  <blockquote>
    <p>COM object that has been separated from its underlying RCW cannot be
    used.</p>
  </blockquote>
  
  <p>Its a dispose related problem. I know as 2nd form is a different thread thats why showing this error. But I need to know the solution. I did not have this problem with GeckoFX-8. Any solution or suggestions will be highly appreciated.</p>
  
  <p>Thanks</p>