Here they are steps to be done:
- Download .admx templates:
http://dl.google.com/dl/edgedl/chrome/policy/policy_templates.zip - You should start creating new GPO as usual on Microsoft domain.
- After that you can follow these screenshots to have a major ideas about core procedure and enhancement gained with .admx templates add:
About Firefox you can follow these blogs articles:
[update 2022.08.19]
Here it is procedure updated to meet Edge step by step actions that you should take place