On Windows, policy support is implemented using Group Policy. Firefox supports setting policies via Active Directory as well as using Local Group Policy.
The ADMX templates for Firefox are available for download here:
https://github.com/mozilla/policy-templates/releases
ADMX templates should be added to the X:\Windows\PolicyDefinitions
directory.
For the latest information on our policies and more details about specific policies is available in the README on our GitHub repository:
https://github.com/mozilla/policy-templates/blob/master/README.md