diff --git a/flake.nix b/flake.nix
index 46f9723..4a231e1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -31,7 +31,7 @@
               inputs.nix-flatpak.homeManagerModules.nix-flatpak
             ];
 
-            home-manager.backupFileExtension = "backup93";
+            home-manager.backupFileExtension = "backup94";
           }
         ];
       };
diff --git a/modules/packages/firefox.nix b/modules/packages/firefox.nix
index 53c3784..553c3f7 100644
--- a/modules/packages/firefox.nix
+++ b/modules/packages/firefox.nix
@@ -22,12 +22,15 @@
         @import "firefox-gnome-theme/userContent.css";
       '';
       settings = {
-        ## Firefox gnome theme ## - https://github.com/rafaelmardojai/firefox-gnome-theme/blob/7cba78f5216403c4d2babb278ff9cc58bcb3ea66/configuration/user.js
-        # (copied into here because home-manager already writes to user.js)
-        "toolkit.legacyUserProfileCustomizations.stylesheets" = true; # Enable customChrome.cs
-        "browser.uidensity" = 0; # Set UI density to normal
-        "svg.context-properties.content.enabled" = true; # Enable SVG context-propertes
-        "browser.theme.dark-private-windows" = false; # Disable private window dark theme
+        # firefox-gnome-theme related
+        "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
+        "browser.uidensity" = 0;
+        "svg.context-properties.content.enabled" = true;
+        "browser.theme.dark-private-windows" = false;
+
+        # do not clear cookies
+        "privacy.clearOnShutdown.history" = false;
+        "privacy.clearOnShutdown.cookies" = false;
       };
     };
   };