You must install the VMware MKS plugin before you can access a VM Viewer interface. If you use the Firefox 3.0 browser, this plugin installation fails.
An error message appears.
Error: Firefox could not install the file at https://<sm_server_hostname>/StageManager/ControlPanel/Machines/MachineDetails/ActiveXControls/xpihandler.ashx?filename=vmware-mks-windows-ff-3.xpi because: Install script not found -204
Go to VMware knowledge base article number 1006950 for details and workaround.
The VMware knowledge base is at kb.vmware.com.