{ ... }: {
  programs.librewolf = {
    enable = true;

    profiles.default = {
      isDefault = true;

      settings = {
        "toolkit.telemetry.enabled" = false;
        "toolkit.telemetry.unified" = false;
        "toolkit.telemetry.server" = "";
        "toolkit.telemetry.archive.enabled" = false;
        "toolkit.telemetry.newProfilePing.enabled" = false;
        "toolkit.telemetry.shutdownPingSender.enabled" = false;
        "toolkit.telemetry.updatePing.enabled" = false;
        "toolkit.telemetry.bhrPing.enabled" = false;
        "toolkit.telemetry.firstShutdownPing.enabled" = false;
        "toolkit.telemetry.coverage.opt-out" = true;
        "toolkit.coverage.opt-out" = true;
        "toolkit.coverage.endpoint.base" = "";
        "browser.ping-centre.telemetry" = false;
        "browser.newtabpage.activity-stream.feeds.telemetry" = false;
        "browser.newtabpage.activity-stream.telemetry" = false;

        "breakpad.reportURL" = "";
        "browser.tabs.crashReporting.sendReport" = false;
        "browser.crashReports.unsubmittedCheck.autoSubmit2" = false;

        "app.shield.optoutstudies.enabled" = false;
        "app.normandy.enabled" = false;
        "app.normandy.api_url" = "";
        "browser.safebrowsing.malware.enabled" = false;
        "browser.safebrowsing.phishing.enabled" = false;
        "browser.safebrowsing.blockedURIs.enabled" = false;
        "browser.safebrowsing.provider.google4.gethashURL" = "";
        "browser.safebrowsing.provider.google4.updateURL" = "";
        "browser.safebrowsing.provider.google.gethashURL" = "";
        "browser.safebrowsing.provider.google.updateURL" = "";
        "browser.safebrowsing.downloads.remote.enabled" = false;

        "geo.enabled" = false;
        "geo.provider.network.url" = "";

        "captivedetect.canonicalURL" = "";
        "network.captive-portal-service.enabled" = false;
        "network.connectivity-service.enabled" = false;

        "privacy.resistFingerprinting" = true;
        "privacy.resistFingerprinting.block_mozAddonManager" = true;
        "privacy.window.maxInnerWidth" = 1600;
        "privacy.window.maxInnerHeight" = 900;
        "webgl.disabled" = true;
        "webgl.enable-webgl2" = false;
        "media.navigator.enabled" = false;
        "media.navigator.video.enabled" = false;

        "media.peerconnection.enabled" = false;
        "media.peerconnection.ice.no_host" = true;
        "media.peerconnection.ice.proxy_only_if_behind_proxy" = true;
        "media.peerconnection.ice.default_address_only" = true;

        "privacy.trackingprotection.enabled" = true;
        "privacy.trackingprotection.pbmode.enabled" = true;
        "privacy.trackingprotection.emailtracking.enabled" = true;
        "privacy.trackingprotection.socialtracking.enabled" = true;
        "privacy.trackingprotection.cryptomining.enabled" = true;
        "privacy.trackingprotection.fingerprinting.enabled" = true;
        "privacy.firstparty.isolate" = true;
        "privacy.partition.network_state" = true;
        "privacy.partition.serviceWorkers" = true;

        "network.cookie.cookieBehavior" = 1;
        "network.cookie.lifetimePolicy" = 0;
        "browser.privatebrowsing.autostart" = false;

        "signon.rememberSignons" = true;
        "signon.autofillForms" = true;
        "signon.generation.enabled" = true;

        "network.trr.mode" = 3;
        "network.trr.uri" = "https://dns.quad9.net/dns-query";
        "network.trr.bootstrapAddress" = "9.9.9.9";
        "network.dns.disableIPv6" = true;
        "network.prefetch-next" = false;
        "network.dns.disablePrefetch" = true;
        "network.predictor.enabled" = false;
        "network.http.speculative-parallel-limit" = 0;
        "browser.places.speculativeConnect.enabled" = false;
        "network.proxy.socks_remote_dns" = true;

        "dom.security.https_only_mode" = true;
        "dom.security.https_only_mode.upgrade_local" = true;
        "security.mixed_content.block_display_content" = true;
        "security.mixed_content.block_active_content" = true;

        "security.tls.version.min" = 3;
        "security.tls.version.max" = 4;
        "security.tls.enable_0rtt_data" = false;
        "security.OCSP.enabled" = 1;
        "security.OCSP.require" = true;
        "security.cert_pinning.enforcement_level" = 2;
        "security.remote_settings.crlite_filters.enabled" = true;
        "security.pki.crlite_mode" = 2;

        "dom.battery.enabled" = false;
        "dom.vr.enabled" = false;
        "dom.vibrator.enabled" = false;
        "dom.gamepad.enabled" = false;
        "dom.netinfo.enabled" = false;
        "dom.telephony.enabled" = false;
        "dom.push.enabled" = false;
        "dom.push.connection.enabled" = false;
        "dom.push.serverURL" = "";

        "browser.send_pings" = false;
        "browser.sessionstore.privacy_level" = 2;
        "browser.urlbar.speculativeConnect.enabled" = false;
        "browser.urlbar.suggest.searches" = false;
        "browser.search.suggest.enabled" = false;
        "browser.formfill.enable" = false;

        "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
      };

      userChrome = ''
        /* =============================================
           Windows 95/98 Theme for LibreWolf
           ============================================= */

        @import url("chrome://userchrome/content/userChrome.css");

        * {
          font-family: "W95FA", "Pixelated MS Sans Serif", "Arial", sans-serif !important;
          font-size: 11px !important;
        }

        /* ---- Window chrome background ---- */
        :root {
          --win95-bg: #c0c0c0;
          --win95-dark: #808080;
          --win95-darker: #404040;
          --win95-light: #ffffff;
          --win95-highlight: #000080;
          --win95-highlight-text: #ffffff;
          --win95-border-light: #dfdfdf;
          --win95-border-dark: #808080;
          --win95-border-darker: #404040;
        }

        /* ---- Toolbar background ---- */
        #navigator-toolbox,
        #toolbar-menubar,
        #TabsToolbar,
        #nav-bar,
        #PersonalToolbar {
          background-color: var(--win95-bg) !important;
          border-bottom: 1px solid var(--win95-dark) !important;
          padding: 2px !important;
        }

        /* ---- Tab bar ---- */
        #TabsToolbar {
          background-color: var(--win95-bg) !important;
        }

        /* Active tab — raised bevel */
        .tab-background:is([selected], [multiselected]) {
          background-color: var(--win95-bg) !important;
          border-top: 2px solid var(--win95-light) !important;
          border-left: 2px solid var(--win95-light) !important;
          border-right: 2px solid var(--win95-darker) !important;
          border-bottom: none !important;
          border-radius: 0 !important;
          margin-bottom: -1px !important;
        }

        /* Inactive tab — sunken */
        .tab-background:not([selected]) {
          background-color: var(--win95-bg) !important;
          border-top: 2px solid var(--win95-dark) !important;
          border-left: 2px solid var(--win95-dark) !important;
          border-right: 2px solid var(--win95-light) !important;
          border-bottom: 1px solid var(--win95-dark) !important;
          border-radius: 0 !important;
        }

        .tab-label {
          color: #000000 !important;
        }

        .tab-background:is([selected]) .tab-label {
          font-weight: bold !important;
        }

        /* ---- URL bar — sunken inset look ---- */
        #urlbar,
        #urlbar-background {
          background-color: #ffffff !important;
          border-top: 2px solid var(--win95-dark) !important;
          border-left: 2px solid var(--win95-dark) !important;
          border-right: 2px solid var(--win95-light) !important;
          border-bottom: 2px solid var(--win95-light) !important;
          border-radius: 0 !important;
          color: #000000 !important;
        }

        #urlbar:focus-within #urlbar-background {
          border-color: var(--win95-darker) !important;
          outline: none !important;
        }

        /* ---- Buttons — raised bevel ---- */
        toolbarbutton,
        .toolbarbutton-1 {
          background-color: var(--win95-bg) !important;
          border-top: 2px solid var(--win95-light) !important;
          border-left: 2px solid var(--win95-light) !important;
          border-right: 2px solid var(--win95-darker) !important;
          border-bottom: 2px solid var(--win95-darker) !important;
          border-radius: 0 !important;
          padding: 3px 5px !important;
          color: #000000 !important;
        }

        toolbarbutton:hover,
        .toolbarbutton-1:hover {
          background-color: var(--win95-bg) !important;
        }

        toolbarbutton:active,
        toolbarbutton[open="true"],
        .toolbarbutton-1:active {
          border-top: 2px solid var(--win95-darker) !important;
          border-left: 2px solid var(--win95-darker) !important;
          border-right: 2px solid var(--win95-light) !important;
          border-bottom: 2px solid var(--win95-light) !important;
          padding: 4px 4px 2px 6px !important;
        }

        /* ---- Title bar — classic Windows blue gradient ---- */
        #titlebar {
          background: linear-gradient(to right, #000080, #1084d0) !important;
          color: #ffffff !important;
        }

        /* ---- Menu bar ---- */
        #toolbar-menubar {
          background-color: var(--win95-bg) !important;
        }

        menubar > menu {
          color: #000000 !important;
          border-radius: 0 !important;
          padding: 2px 6px !important;
        }

        menubar > menu:hover,
        menubar > menu[_moz-menuactive="true"] {
          background-color: var(--win95-highlight) !important;
          color: var(--win95-highlight-text) !important;
        }

        /* ---- Bookmarks toolbar ---- */
        #PersonalToolbar toolbarbutton {
          border: 1px solid transparent !important;
        }

        #PersonalToolbar toolbarbutton:hover {
          border-top: 2px solid var(--win95-light) !important;
          border-left: 2px solid var(--win95-light) !important;
          border-right: 2px solid var(--win95-darker) !important;
          border-bottom: 2px solid var(--win95-darker) !important;
        }

        /* ---- Sidebar ---- */
        #sidebar-box {
          background-color: var(--win95-bg) !important;
          border-right: 2px solid var(--win95-dark) !important;
        }

        /* ---- Find bar ---- */
        #FindToolbar {
          background-color: var(--win95-bg) !important;
          border-top: 2px solid var(--win95-dark) !important;
        }

        /* ---- Scrollbars ---- */
        scrollbar {
          background-color: var(--win95-bg) !important;
          width: 16px !important;
        }

        scrollbar thumb {
          background-color: var(--win95-bg) !important;
          border-top: 2px solid var(--win95-light) !important;
          border-left: 2px solid var(--win95-light) !important;
          border-right: 2px solid var(--win95-darker) !important;
          border-bottom: 2px solid var(--win95-darker) !important;
          border-radius: 0 !important;
        }

        /* ---- Status bar ---- */
        #statuspanel-label {
          background-color: var(--win95-bg) !important;
          border-top: 2px solid var(--win95-dark) !important;
          color: #000000 !important;
          border-radius: 0 !important;
        }

        * {
          border-radius: 0 !important;
        }
      '';
    };
  };
}