diff --git a/system/firefox.nix b/system/firefox.nix
index 988ae0b9..14a28760 100644
--- a/system/firefox.nix
+++ b/system/firefox.nix
@@ -52,6 +52,10 @@
           installation_mode = "force_installed";
           install_url = "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi";
         };
+        "addon@simplelogin" = {
+          installation_mode = "force_installed";
+          install_url = "https://addons.mozilla.org/firefox/downloads/latest/simplelogin/latest.xpi";
+        };
         "{8446b178-c865-4f5c-8ccc-1d7887811ae3}" = {
           installation_mode = "force_installed";
           install_url = "https://addons.mozilla.org/firefox/downloads/latest/catppuccin-mocha-lavender-git/latest.xpi";