diff --git a/programs/firefox/default.nix b/programs/firefox/default.nix
index 696d6c6..209e00b 100644
--- a/programs/firefox/default.nix
+++ b/programs/firefox/default.nix
@@ -105,7 +105,7 @@
           "browser.warnOnQuitShortcut" = false;
           "distribution.searchplugins.defaultLocale" = "en-GB";
           "doh-rollout.home-region" = "GB";
-          "extensions.activeThemeID" = "firefox-alpenglow@mozilla.org";
+          "extensions.activeThemeID" = "default-theme@mozilla.org";
           "extensions.formautofill.creditCards.enabled" = false;
           "general.useragent.locale" = "en-GB";
           "intl.accept_languages" = "en-gb,en";