javascript errors on accessing portal application using Mozilla browser

Issue

• A javascript error while working with the jboss portal platform . It is not important if its a custom page or on a administration page. The javascript error is:

  Permission denied for <http://localhost:8280> to call method UnnamedClass.handleEvent
  

8280 is the port that I am using. I don't have ssl enabled.
Everything seems to work well despite of the error.