diff --git a/home-manager/progs/zen/default.nix b/home-manager/progs/zen/default.nix
index 5386a26..78a2adf 100644
--- a/home-manager/progs/zen/default.nix
+++ b/home-manager/progs/zen/default.nix
@@ -93,6 +93,13 @@ in
         "signon.rememberSignons" = false;
         "signon.autofillForms" = false;
         "signon.management.page.breach-alerts.enabled" = false;
+        "signon.formlessCapture.enabled" = false;
+        "signon.privateBrowsingCapture.enabled" = false;
+        # disable the autocomplete popup on login fields
+        "signon.firefoxRelay.feature" = "";
+        "signon.generation.enabled" = false;
+        # disable passkey/webauthn prompts from the built-in manager
+        "security.webauthn.enable_conditional_mediation" = false;
       };
     };
   };