diff --git a/modules/programs/firefox/mkFirefoxModule.nix b/modules/programs/firefox/mkFirefoxModule.nix
index 23533ce50..addf8ac83 100644
--- a/modules/programs/firefox/mkFirefoxModule.nix
+++ b/modules/programs/firefox/mkFirefoxModule.nix
@@ -61,7 +61,8 @@ let
     }) // {
       General = {
         StartWithLastProfile = 1;
-        Version = 2;
+      } // lib.optionalAttrs (cfg.profileVersion == null) {
+        Version = cfg.profileVersion;
       };
     };
 
@@ -342,6 +343,13 @@ in {
       };
     });
 
+    profileVersion = mkOption {
+      internal = true;
+      type = types.nullOr types.ints.unsigned;
+      default = if isDarwin then null else 2;
+      description = "profile version, set null for nix-darwin";
+    };
+
     profiles = mkOption {
       inherit visible;
       type = types.attrsOf (types.submodule ({ config, name, ... }: {