Use localStorageOnly

flake.nix

@@ -1,12 +1,31 @@
 {
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs";
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-25.11";
     flake-utils.url = "github:numtide/flake-utils";
+    yesod-middleware-csp = {
+      url = "github:SupercedeTech/yesod-middleware-csp";
+      flake = false;
+    };
   };
 
-  outputs = { self, nixpkgs, flake-utils }:
+  outputs = { self, nixpkgs, flake-utils, yesod-middleware-csp }:
     flake-utils.lib.eachDefaultSystem (system:
-      with nixpkgs.legacyPackages.${system};
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [(_: prev: {
+            haskellPackages = prev.haskellPackages.override {
+              overrides = _: hprev: {
+                yesod-middleware-csp = prev.haskell.lib.doJailbreak
+                  (hprev.callCabal2nix "supercede-yesod-middleware-csp"
+                    yesod-middleware-csp
+                    { });
+              };
+            };
+          })];
+        };
+      in
+      with pkgs;
       let
         t = lib.trivial;
         hl = haskell.lib;

src/Yesod/Pendo.hs

@@ -76,7 +76,8 @@ addPendo = do
               guidesFailed: function() {
                 document.dispatchEvent(new Event("PENDO_GUIDES_FAILED"));
               }
-            }
+            },
+            localStorageOnly: true
           });
         })(#{apiKey});
       |]