Hi Yazeed,
According to this link, the firewall service module is supported with Sup 2T.
Q. Which service modules are supported with Cisco Supervisor Engine 2T?
A. The following service modules are supported: Cisco Catalyst 6500 Series Firewall Services Module (FWSM), Cisco Adaptive Security Appliances (ASA) service module, Cisco Application Control Engine (ACE) 20, and Cisco Catalyst 6500 Series/7600 Series Wireless Services Module (WiSM) and WiSM-2.
see link:
http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/catalyst-6500-series-supervisor-engine-2t/qa_c67-648478.html
HTH