Force Enable SEP Add-On via GPO for Firefox and Chrome

I have tried adding this via GPO by adding {6D53EC84-6AAE-4787-AEEE-F4628F01010C} with a value of 1 after finding this thread https://www-secure.symantec.com/connect/forums/browser-intrusion-prevention-add-problem#comment-5861811.

This does not seem to apply, is there another way to attempt to do this via GPO that someone can help me with?  It applies to IE fine but I was hoping there is a way to also add this for Firefox and Chrome, any info would be greatly appreciated.  Currently running SEP client and manager both on version 12.1.4100.4126.105

Thanks,