{ ... }:

let
  # Requirements:
  # - is valid connection target (from FF perspective)
  # - doesn't have any negative effects on the user privacy or security
  h = "127.0.0.1";
  u = "http://${h}";
in {
  meta.description = ''
    Firefox communicates with external services in many different ways. Not all of them
    happen on startup, and they can be triggered on different intervals.

    This is a desperate effort to prevent as much of that communication as possible, by depriving FF of all configurable
    URLs. It will break things, put the users security/privacy at risk, and probably shouldn't be enabled.

    Even so, this list may be insufficient. It was created manually from an about:config listing
    for the searchterms "url", "uri", "endpoint", and "server", so it will miss hidden (but defaulted) and hardcoded URLs.

    Further consideration for the placeholder value is required.

    Known issues:
      - This list will get outdated rather quickly
      - Typos and renaming of keys are not caught in any way
  '';

  preferences = {
    app = {
      feedback.baseURL = u;
      releaseNotesURL = u;
      support.baseURL = u;
      update = {
        url.details = u;
        url.manual = u;
      };
    };

    browser = {
      uitour.url = u;

      contentblocking = {
        report = {
          cookie.url = u;
          cryptominer.url = u;
          fingerprinter.url = u;

          lockwise = {
            how_it_works.url = u;
          };

          monitor = {
            enabled = false;
            url = u;
            how_it_works.url = u;
            sign_in_url = u;
          };
        };
      };

      newtabpage.activity-stream = {
        discoverystream = {
          config = "{}";
          endpoints = u;
          endpointSpocsClear = u;
        };

        default.sites = "";
        feeds = {
          snippets = false;
          section.topstories.options = "{}";
        };
        asrouter.providers.snippets = false;

        fxaccounts.endpoint = u;

        telemetry.structuredIngestion.endpoint = u;
      };

      safebrowsing = {
        downloads.remote.url = u;
        provider =
          let mock = {
                advisoryURL = u;
                dataSharingURL = u;
                gethashURL = u;
                reportMalwareMistakeURL = u;
                reportPhishMistakeURL = u;
                reportURL = u;
                updateURL = u;
              };
          in {
            google = mock;
            google4 = mock;
            mozilla = mock;
          };
      };

      search.searchEnginesURL = u;
    };

    captivedetect.canonicalURL = u;
    datareporting = {
      healthreport.infoURL = u;
      firstRunURL = u;
      policy.firstRunURL = u;
    };

    dom.push.serverURL = "wss://${h}";

    extensions = {
      abuseReport = {
        amoDetailsURL = u;
        url = u;
      };

      blocklist = {
        detailsURL = u;
        itemURL = u;
      };

      getAddons = {
        discovery.api_url = u;
        get.url = u;
        langpacks.url = u;
        link.url = u;
        search.browseURL = u;
      };

      recommendations = {
        privacyPolicyUrl = u;
        themeRecommendationUrl = u;
      };

      systemAddon.update.url = u;
      update.background.url = u;
      update.url = u;
      webservice.discoverURL = u;
    };

    media.gmp-manager.url = u;

    identity = {
      fxaccounts = {
        remote.root = u;
        auth.uri = u;
        remote = {
          oauth.uri = u;
          pairing.uri = u;
          profile.uri = u;
        };

        service = {
          monitorLoginUrl = u;
          sendLoginUrl = u;
        };
      };
      sync.tokenserver.uri = u;
      sendtabpromo.url = u;
    };

    services.settings.server = u;

    network.trr.uri = u;

    toolkit = {
      telemetry.server = u;
      coverage.endpoint.base = u;
    };

    security = {
      # TODO: investigate exploit potential (I told you not to enable it!)
      certerrors.mitm.priming.endpoint = u;

      ssl.errorReporting.url = u;

      remote_settings = {
        intermediates.enabled = false;
        intermediates.signer = "";
        crlite_filters.enabled = false;
        crlite_filters.signer = "";
      };
    };

    signon.management.page = {
      breachAlertUrl = u;
      mobileAndroidURL = u;
      mobileAppleURL = u;
    };

    webextensions.storage.sync.serverURL = u;
  };
}