I haven't noticed Firefox for Enterprise before. At first I thought it was a new name for extended support release, but Enterprise is available in both ESR and the regular releases. I can't tell from the landing page what the difference is. Is this just about streamlining enterprise-wide deployment?
It's not a separate version, it's separate notes about how the new version (and new ESR) are likely to affect enterprise IT. It's explicitly where they put notes about changes to the Group Policy templates, for example.
Yes and Active Directory Group Policies are just one of the ways to distribute and enforce policies on Firefox, there's also macOS profiles and policies.json files for all versions. In my old job I used a policies.json file. Annoyingly, there wasn't a way to write path values in a platform-agnostic way (e.g. to specify download file location) so it was necessary to maintain two versions for macOS and Windows.
