diff --git a/nix/sources.json b/nix/sources.json
index f7a5d438..55a8c277 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -87,6 +87,18 @@
         "url": "https://github.com/NixOS/nixpkgs/archive/87807e64a5ef5206b745a40af118c7be8db73681.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
+    "nixos-19.09": {
+        "branch": "nixos-19.09",
+        "description": "Nix Packages collection",
+        "homepage": "",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "75f4ba05c63be3f147bcc2f7bd4ba1f029cedcb1",
+        "sha256": "157c64220lf825ll4c0cxsdwg7cxqdx4z559fdp7kpz0g6p8fhhr",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/75f4ba05c63be3f147bcc2f7bd4ba1f029cedcb1.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "obelisk": {
         "branch": "master",
         "description": "Obelisk provides an easy way to develop and deploy your Reflex project for web and mobile",
diff --git a/nixos/roles/firefox-sync.nix b/nixos/roles/firefox-sync.nix
new file mode 100644
index 00000000..19cc8818
--- /dev/null
+++ b/nixos/roles/firefox-sync.nix
@@ -0,0 +1,10 @@
+{ pkgs, ... }: {
+  disabledModules = [ "services/networking/firefox/sync-server.nix" ];
+  imports = [
+    "${pkgs.sources."nixos-19.09"}/nixos/modules/services/networking/firefox/sync-server.nix"
+  ];
+  services.firefox = {
+    enable = true;
+    allowNewUsers = false;
+  };
+}