I don't believe there is a way from SEPM.
This would need to be done via third party way, such as gpo.
The note at the bottom of this KB article leads me to believe extra steps outside of SEPM need to be taken to do it:
https://www.symantec.com/business/support/index?page=content&id=TECH174537
Check this KB article on same behaviour with IE:
https://www.symantec.com/business/support/index?page=content&id=TECH164924
Seems to be the issue of IE/Firefox and GPO is the workaround.