diff --git a/modules/cachix/iohk.nix b/modules/cachix/iohk.nix
new file mode 100644
index 0000000..03e5652
--- /dev/null
+++ b/modules/cachix/iohk.nix
@@ -0,0 +1,6 @@
+{
+  nix.settings = {
+    trusted-public-keys = [ "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=" ];
+    substituters = [ "https://hydra.iohk.io" ];
+  };
+}
\ No newline at end of file
diff --git a/users/modules/firefox/default.nix b/users/modules/firefox/default.nix
index 0627005..d7795e3 100644
--- a/users/modules/firefox/default.nix
+++ b/users/modules/firefox/default.nix
@@ -19,6 +19,7 @@
         lockPref("privacy.clearOnShutdown.sessions", false);
         lockPref("privacy.clearOnShutdown.cookies", false);
         lockPref("services.sync.engine.passwords", false);
+        lockPref("network.cookie.lifetimePolicy", 0);
       '';
       extraPolicies = {
         CaptivePortal = false;