Encontré lo siguiente:

VMware ESX 3.0 y vCenter 2.0:

Browser Requirements
To access VMware Virtual Infrastructure Web Access, you should be running one of the
following:
! Internet Explorer 6.0
! Mozilla Firefox 1.0.8 or higher for Microsoft Windows
! Mozilla Firefox 1.0.8 or higher for Linux
NOTE Other browsers are not actively excluded, but VMware has certified VI Web Access with
only the browsers listed above. Please refer to your browser vendor's own
documentation for additional requirements. For the best experience, make sure your
browser includes all of the security and stability updates recommended by its vendor.

http://www.vmware.com/pdf/vi3_301_201_web_access.pdf

vSphere 4:

Browser Requirements
You can use Microsoft Internet Explorer and Mozilla Firefox Web browsers to run vSphere Web Access.
VMware has certified vSphere Web Access with the following browsers. Other browsers are not, however,
actively excluded. For additional requirements, see your browser vendor's documentation. Your browser must
include all security and stability updates that the vendor recommends.
n Internet Explorer 6.0, 7.0, or later for Microsoft Windows
n Mozilla Firefox 2.0, 3.0, or later for Microsoft Windows
n Mozilla Firefox 2.0, 3.0, or later for Linux

http://www.vmware.com/pdf/vsphere4/r40/vsp_40_web_access.pdf

Si mis respuestas fueron útiles por favor considera el otorgamiento de puntos marcando la respuesta correcta o útil.

Saludos/Regards
Nicolas Solop
Buenos Aires, Argentina

Supongo que encontrarás una solución utilizando los programas soportados (que para eso se da soporte ya que no suelen respetar los estandares) mas que forzar una aplicación no soportada por mucho que siga los estandares.

A mi firefox 3.0 no me dá ningún problema en server 2.0.1.

Saludos