Note: There are no changes to the ADMX templates in this release. I bumped the version to be consistent. There is no need to move to these templates if you are using v3.7 or v3.8.
There are additional translations though, and some documentation fixes. Thanks to @vossni and @williamtheaker for changes in this release.
Note: While these templates will work for Firefox ESR 78, they contain new policies that are not in Firefox ESR 78. If you need to manage Firefox ESR 78, you should use v2.12
The README that corresponds to this release is:
https://github.com/mozilla/policy-templates/blob/v3.9/README.md
For more information about Firefox 100 and Firefox 91.9 ESR, we now have enterprise release notes.
Personal Note: There haven't been a lot of policy changes lately because I've been working on other projects. Enterprise work is continuing though, and there will be more activity in the next few months.