If you are using Firefox on Windows, you must add the IP address of the CC-SG to the Allowed Sites for Add-ons list and the Allowed Sites for Pop-ups list in the browser before connecting to a VMW Viewer interface.
The first time you connect to a virtual machine, using any supported browser, you may be asked to download an add-on from VMware. Once the add-on is installed, restart your browser. If the add-on installation fails, see Install VMware Plugins for Firefox 3.0.