diff --git a/apps/firefox.nix b/apps/firefox.nix
new file mode 100644
index 0000000..5667e39
--- /dev/null
+++ b/apps/firefox.nix
@@ -0,0 +1,24 @@
+{ config, pkgs, lib, ... }:
+let
+  lock-false = {
+    Value = false;
+    Status = "locked";
+  };
+  lock-true = {
+    Value = true;
+    Status = "locked";
+  };
+in
+{
+  programs.firefox = {
+    enable = true;
+    policies = {
+      Preferences = {
+        "widget.wayland.vsync.enabled" = lock-false;
+        "widget.wayland.opaque-region.enabled" = lock-false;
+        "media.ffmpeg.vaapi.enabled" = lock-true;
+        "media.hardware-video-decoding.force-enabled" = lock-true;
+      };
+    };
+  };
+}
diff --git a/configuration.nix b/configuration.nix
index e0a93b5..ba80618 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -10,6 +10,7 @@
       ./hardware-configuration.nix
       ./nix-alien.nix
       ./wireguard.nix
+      ./apps/firefox.nix
     ];
 
   # Bootloader.
@@ -151,7 +152,6 @@
   };
 
   # Install firefox.
-  programs.firefox.enable = true;
 
   programs.nix-ld.enable = true;