Hi,
I think you should check with SEP 12.1 RU1
Improved security and performance
Release Update 1 includes the following enhancements:
- The Firewall policy provides better support for mobile broadband adapters. The firewall is compatible with NDIS6 interfaces on Windows Vista and later.
- Browser intrusion prevention in the Intrusion Prevention policy is compatible with Firefox 5, Firefox 6, and Firefox 7.
- You can specify exceptions for a manual scan, Auto-Protect scan, or both.
Check following article for more details
http://www.symantec.com/docs/TECH174565