Browser Extenssion Manage

[Indra]

Hello Friends, 

I am looking for some solution 

1- User should not be able to install New Extension on browser but existing Extension should work  Both for chrome and Firefox.

[AJPinto]

There is no way to automatically bless what is already installed. You would need to manually bless everything that is currently installed with a Configuration Profile or it will be removed when you start disallowing users from installing extensions.