diff --git a/tests/default.nix b/tests/default.nix
index d9686209f..e277e0b2e 100644
--- a/tests/default.nix
+++ b/tests/default.nix
@@ -288,6 +288,7 @@ in import nmtSrc {
     ./modules/programs/boxxy
     ./modules/programs/cavalier
     ./modules/programs/eww
+    ./modules/programs/firefox
     ./modules/programs/firefox/firefox.nix
     ./modules/programs/firefox/floorp.nix
     ./modules/programs/foot
diff --git a/tests/modules/programs/firefox/default.nix b/tests/modules/programs/firefox/default.nix
new file mode 100644
index 000000000..4e7b93c69
--- /dev/null
+++ b/tests/modules/programs/firefox/default.nix
@@ -0,0 +1 @@
+{ "firefox-multiple-derivatives" = ./multiple-derivatives.nix; }
diff --git a/tests/modules/programs/firefox/multiple-derivatives.nix b/tests/modules/programs/firefox/multiple-derivatives.nix
new file mode 100644
index 000000000..12a35de70
--- /dev/null
+++ b/tests/modules/programs/firefox/multiple-derivatives.nix
@@ -0,0 +1,16 @@
+{ config, lib, ... }:
+
+lib.mkIf config.test.enableBig {
+  programs.firefox = {
+    enable = true;
+    package = null;
+  };
+  programs.floorp = {
+    enable = true;
+    package = null;
+  };
+  programs.librewolf = {
+    enable = true;
+    package = null;
+  };
+}