first commit

flake.nix

@@ -0,0 +1,32 @@
+{
+  description = "Figma Windows UA Spoofer - Firefox signing environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          packages = with pkgs; [
+            bash
+            zip
+            web-ext
+            nodejs
+          ];
+        };
+
+        apps.sign-firefox = {
+          type = "app";
+          program = toString (pkgs.writeShellScript "sign-firefox" ''
+            set -euo pipefail
+            exec ${pkgs.bash}/bin/bash ./sign-firefox.sh
+          '');
+        };
+      });
+}