Hello,
IPS uses a browser extension for Internet Explorer or Firefox to provide this protection. For more information about supported browsers, see Supported browser versions for browsers intrusion prevention.
Symantec Endpoint Protection (SEP) 12.1.3 supports Mozilla Firefox version 3.x - 16.x.
Firefox Version 22 is not supported.
Check the following items:
Supported browser versions for browsers Intrusion Prevention
http://www.symantec.com/docs/TECH174537
Expected behavior of the browser intrusion prevention
http://www.symantec.com/docs/TECH172174
Enable or disable intrusion prevention or browser intrusion prevention
http://www.symantec.com/docs/HOWTO80887
Hope that helps!