install.fairie/system/usr/lib/firefox-esr/distribution/policies.json

{
  "policies": {
    "DisableTelemetry": true,
    "DontCheckDefaultBrowser": true,
    "EnableTrackingProtection": {
      "Cryptomining": true,
      "Fingerprinting": true,
      "Locked": false,
      "Value": true
    },
    "Homepage": {
      "Locked": false,
      "StartPage": "previous-session",
      "URL": "http://betelgeuse.home"
    },
    "NoDefaultBookmarks": true,
    "OfferToSaveLogins": false,
    "OverrideFirstRunPage": "",
    "PasswordManagerEnabled": false
  }
}