diff --git a/pkgs/additional/firefox-extensions/default.nix b/pkgs/additional/firefox-extensions/default.nix
index d52f487c4..268079db1 100644
--- a/pkgs/additional/firefox-extensions/default.nix
+++ b/pkgs/additional/firefox-extensions/default.nix
@@ -137,6 +137,7 @@ in (lib.makeScope newScope (self: with self; {
     firefox-xdg-open = callPackage ./firefox-xdg-open { };
     i-still-dont-care-about-cookies = callPackage ./i-still-dont-care-about-cookies { };
     open-in-mpv = callPackage ./open-in-mpv { };
+    passff = callPackage ./passff { };
     sidebery = callPackage ./sidebery { };
 
     ether-metamask = fetchVersionedAddon rec {
diff --git a/pkgs/additional/firefox-extensions/passff/default.nix b/pkgs/additional/firefox-extensions/passff/default.nix
new file mode 100644
index 000000000..757ff82c8
--- /dev/null
+++ b/pkgs/additional/firefox-extensions/passff/default.nix
@@ -0,0 +1,32 @@
+{
+  fetchFromGitea,
+  gitUpdater,
+  stdenv,
+  zip,
+}:
+stdenv.mkDerivation rec {
+  pname = "passff";
+  version = "1.20.1";
+  src = fetchFromGitea {
+    domain = "codeberg.org";
+    owner = "PassFF";
+    repo = "passff";
+    rev = version;
+    hash = "sha256-3T7BLEeYYWsyD9gWh3OnrcyIKkOtQzjLf/IwMt8A1uw=";
+  };
+
+  nativeBuildInputs = [ zip ];
+
+  makeFlags = [
+    "VERSION=${version}"
+  ];
+
+  installPhase = ''
+    runHook preInstall
+    install bin/$version/passff.xpi $out
+    runHook postInstall
+  '';
+
+  passthru.updateScript = gitUpdater { };
+  passthru.extid = "passff@invicem.pro";
+}