{...}: {
  programs.firefox = {
    profiles.leyla = {
      settings = {
        # Security
        "privacy.trackingprotection.enabled" = true;
        "dom.security.https_only_mode" = true;
        "dom.security.https_only_mode_pbm" = true;
        "dom.security.https_only_mode_error_page_user_suggestions" = true;

        # Privacy & Data Protection
        "extensions.formautofill.addresses.enabled" = false;
        "extensions.formautofill.creditCards.enabled" = false;
        "signon.rememberSignons" = false;
        "privacy.sanitize.sanitizeOnShutdown" = true;
        "privacy.clearOnShutdown_v2.cache" = true;
        "privacy.clearOnShutdown_v2.cookiesAndStorage" = true;
        "privacy.clearOnShutdown_v2.historyFormDataAndDownloads" = true;
        "urlclassifier.trackingSkipURLs" = "";
        "urlclassifier.features.socialtracking.skipURLs" = "";

        # Disable telemetry and data collection
        "app.shield.optoutstudies.enabled" = false;
        "browser.discovery.enabled" = false;
        "browser.newtabpage.activity-stream.feeds.telemetry" = false;
        "browser.newtabpage.activity-stream.telemetry" = false;
        "browser.ping-centre.telemetry" = false;
        "datareporting.healthreport.service.enabled" = false;
        "datareporting.healthreport.uploadEnabled" = false;
        "datareporting.policy.dataSubmissionEnabled" = false;
        "datareporting.sessions.current.clean" = true;
        "devtools.onboarding.telemetry.logged" = false;
        "toolkit.telemetry.archive.enabled" = false;
        "toolkit.telemetry.bhrPing.enabled" = false;
        "toolkit.telemetry.enabled" = false;
        "toolkit.telemetry.firstShutdownPing.enabled" = false;
        "toolkit.telemetry.hybridContent.enabled" = false;
        "toolkit.telemetry.newProfilePing.enabled" = false;
        "toolkit.telemetry.prompted" = 2;
        "toolkit.telemetry.rejected" = true;
        "toolkit.telemetry.reportingpolicy.firstRun" = false;
        "toolkit.telemetry.server" = "";
        "toolkit.telemetry.shutdownPingSender.enabled" = false;
        "toolkit.telemetry.unified" = false;
        "toolkit.telemetry.unifiedIsOptIn" = false;
        "toolkit.telemetry.updatePing.enabled" = false;
      };
    };
  };
}