diff --git a/.config/nix/flake.lock b/.config/nix/flake.lock
index d13e380..ae20388 100644
--- a/.config/nix/flake.lock
+++ b/.config/nix/flake.lock
@@ -36,6 +36,26 @@
         "type": "github"
       }
     },
+    "firefox-darwin": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1729386071,
+        "narHash": "sha256-IoXOCFcEmlQVFnRRDq0mhTa8GYnNfgtT2cWYf8mA0XE=",
+        "owner": "bandithedoge",
+        "repo": "nixpkgs-firefox-darwin",
+        "rev": "360274d0df59a85738001bbbb52e626f779baea5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "bandithedoge",
+        "repo": "nixpkgs-firefox-darwin",
+        "type": "github"
+      }
+    },
     "flake-compat": {
       "flake": false,
       "locked": {
@@ -213,6 +233,7 @@
     },
     "root": {
       "inputs": {
+        "firefox-darwin": "firefox-darwin",
         "home-manager": "home-manager",
         "nix-darwin": "nix-darwin",
         "nixpkgs": "nixpkgs",
diff --git a/.config/nix/flake.nix b/.config/nix/flake.nix
index b7b0a0a..74bd23d 100644
--- a/.config/nix/flake.nix
+++ b/.config/nix/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "null2264's Nix Setup";
 
-  outputs = inputs@{ self, nix-darwin, nixpkgs, home-manager, system-manager }:
+  outputs = inputs@{ self, nix-darwin, nixpkgs, home-manager, system-manager, ... }:
   let
     vars = {
       rev = self.rev or self.dirtyRev or null;
@@ -47,5 +47,10 @@
       url = "github:numtide/system-manager/c93e62f2e962b54fd961798731d25eaa5778dbe2";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    firefox-darwin = {
+      url = "github:bandithedoge/nixpkgs-firefox-darwin";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 }
diff --git a/.config/nix/lib/mkSystem.nix b/.config/nix/lib/mkSystem.nix
index 9849ada..c06bc62 100644
--- a/.config/nix/lib/mkSystem.nix
+++ b/.config/nix/lib/mkSystem.nix
@@ -1,27 +1,13 @@
 system: nixpkgs:  # e.g. x86_64-linux
 
-let
-  disablePyChecks = pkg: pkg.overridePythonAttrs (old: {
-    doCheck = false;
-    doInstallCheck = false;
-    dontCheck = true;
-  });
-in {
+{
   system = system;
   pkgs = import nixpkgs {
     inherit system;
-    overlays = [(final: prev: {
-      pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [(pyfinal: pyprev: {
-        dnspython = (disablePyChecks pyprev.dnspython).overridePythonAttrs (old: {
-          disabledTests = [
-            # This test is unreliable when my internet is throttled by Indonesian ISP, timeout everywhere... lovely...
-            "test_resolver"
-          ] ++ old.disabledTests;
-        });
-        pillow = disablePyChecks pyprev.pillow;
-        cherrypy = disablePyChecks pyprev.cherrypy;
-      })];
-    })];
+    overlays =
+      [
+        (import ../overlays/python.nix)
+      ];
     config.allowUnfree = true;
   };
 }
diff --git a/.config/nix/overlays/python.nix b/.config/nix/overlays/python.nix
new file mode 100644
index 0000000..d52390a
--- /dev/null
+++ b/.config/nix/overlays/python.nix
@@ -0,0 +1,20 @@
+final: prev:
+
+let
+  disablePyChecks = pkg: pkg.overridePythonAttrs (old: {
+    doCheck = false;
+    doInstallCheck = false;
+    dontCheck = true;
+  });
+in {
+  pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [(pyfinal: pyprev: {
+    dnspython = (disablePyChecks pyprev.dnspython).overridePythonAttrs (old: {
+      disabledTests = [
+        # This test is unreliable when my internet is throttled by Indonesian ISP, timeout everywhere... lovely...
+        "test_resolver"
+      ] ++ old.disabledTests;
+    });
+    pillow = disablePyChecks pyprev.pillow;
+    cherrypy = disablePyChecks pyprev.cherrypy;
+  })];
+}
diff --git a/.config/nix/systems/darwin/default.nix b/.config/nix/systems/darwin/default.nix
index a8c56ab..6f174cb 100644
--- a/.config/nix/systems/darwin/default.nix
+++ b/.config/nix/systems/darwin/default.nix
@@ -3,6 +3,7 @@
 let
   mkCommon = import ../../lib/mkCommon.nix;
   mkSystem = import ../../lib/mkSystem.nix;
+  pkgs.overlays = pkgs.overlays ++ [ inputs.firefox-darwin.overlay ];
 in
 {
   # Host list