Firefox policy https://mozilla.github.io/policy-templates/ Stays at /usr/lib/firefox/distribution/policies.json

policies.json

{
  "policies": {
    "DisableAccounts": true,
    "DisableFirefoxAccounts": true,
    "DisableFirefoxStudies": true,
    "DisableFeedbackCommands": true,
    "DisableTelemetry": true,
    "DisableSetDesktopBackground": true,
    "SkipTermsOfUse": true,
    "DisplayMenuBar": "never",
    "GenerativeAI": {
      "Enabled": false,
      "Chatbot": false,
      "LinkPreviews": false,
      "TabGroups": false,
      "Locked": true
    },
    "UserMessaging": {
      "ExtensionRecommendations": false,
      "FeatureRecommendations": false,
      "MoreFromMozilla": false,
      "FirefoxLabs": false,
      "Locked": true
    }
  }
}