Tor Browser is denying ESR policies.json. This should work because TB is ESR fork.
https://www.ghacks.net/2018/05/21/enterprise-policy-generator-add-on-for-firefox/
What: Create a file "TorBrowser/distribution/policies.json" to disable telemetry and other annoyances
Expected behavior: The browser obey policies.json because Tor Browser is based on Firefox ESR
Actual result: "Only Allowed on ESR" error message on Browser Console