diff --git a/system/firefox.nix b/system/firefox.nix
index d55dbbf2..b6294ec6 100644
--- a/system/firefox.nix
+++ b/system/firefox.nix
@@ -59,9 +59,14 @@
         #   install_url = "https://addons.mozilla.org/firefox/downloads/latest/catppuccin-mocha-lavender-git/latest.xpi";
         # };
         # Sweet-Dark theme
-        "{59f619c8-220b-4a27-8918-bf1537bc060a}" = {
+        # "{59f619c8-220b-4a27-8918-bf1537bc060a}" = {
+        #   installation_mode = "force_installed";
+        #   install_url = "https://addons.mozilla.org/firefox/downloads/latest/sweet-dark/latest.xpi";
+        # };
+        # Tokyo Night Niivu
+        "{c6698fd1-fe9b-4eae-95d5-fe1703820469}" = {
           installation_mode = "force_installed";
-          install_url = "https://addons.mozilla.org/firefox/downloads/latest/sweet-dark/latest.xpi";
+          install_url = "https://addons.mozilla.org/firefox/downloads/latest/tokyo-night-niivu/latest.xpi";
         };
       };
       FirefoxHome = {
@@ -184,7 +189,7 @@
         ];
         "browser.search.region" = "GB";
         "browser.warnOnQuitShortcut" = false;
-        "extensions.activeThemeID" = "{59f619c8-220b-4a27-8918-bf1537bc060a}";
+        "extensions.activeThemeID" = "{c6698fd1-fe9b-4eae-95d5-fe1703820469}";
         "intl.accept_languages" = "en-gb,en";
         "intl.locale.requested" = "en-gb,en";
         "intl.regional_prefs.use_os_locales" = false;