diff --git a/flake.lock b/flake.lock
index dd5d963..74fa6df 100644
--- a/flake.lock
+++ b/flake.lock
@@ -327,16 +327,16 @@
         ]
       },
       "locked": {
-        "lastModified": 1763992789,
-        "narHash": "sha256-WHkdBlw6oyxXIra/vQPYLtqY+3G8dUVZM8bEXk0t8x4=",
+        "lastModified": 1764736872,
+        "narHash": "sha256-4mqLegNQeD54X7enm6EI9aNWl6CaIfyhl5PaYoGYwqk=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "44831a7eaba4360fb81f2acc5ea6de5fde90aaa3",
+        "rev": "3366918730bb6b699395a9d237397f1d710a94b3",
         "type": "github"
       },
       "original": {
         "owner": "nix-community",
-        "ref": "release-25.05",
+        "ref": "release-25.11",
         "repo": "home-manager",
         "type": "github"
       }
@@ -408,16 +408,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1763622513,
-        "narHash": "sha256-1jQnuyu82FpiSxowrF/iFK6Toh9BYprfDqfs4BB+19M=",
+        "lastModified": 1764522689,
+        "narHash": "sha256-SqUuBFjhl/kpDiVaKLQBoD8TLD+/cTUzzgVFoaHrkqY=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "c58bc7f5459328e4afac201c5c4feb7c818d604b",
+        "rev": "8bb5646e0bed5dbd3ab08c7a7cc15b75ab4e1d0f",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixos-25.05",
+        "ref": "nixos-25.11",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index 1d4f9c2..dea1c65 100644
--- a/flake.nix
+++ b/flake.nix
@@ -9,9 +9,9 @@
       inputs.nixpkgs.follows = "nixpkgs-unstable";
     };
     ## stable
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
     home-manager = {
-      url = "github:nix-community/home-manager/release-25.05";
+      url = "github:nix-community/home-manager/release-25.11";
       inputs.nixpkgs.follows = "nixpkgs";
     };
     # secrets management
diff --git a/home-manager/firefox/default.nix b/home-manager/firefox/default.nix
index 0a767c1..4b077fd 100644
--- a/home-manager/firefox/default.nix
+++ b/home-manager/firefox/default.nix
@@ -389,6 +389,7 @@ in
           youtube-nonstop
           sidebery
           vimium
+          user-agent-string-switcher
         ];
         inherit search;
       };
@@ -420,6 +421,8 @@ in
           keepassxc-browser
           youtube-nonstop
           sidebery
+          vimium
+          user-agent-string-switcher
         ];
         inherit search;
       };
@@ -449,6 +452,7 @@ in
           ublock-origin
           youtube-nonstop
           sidebery
+          user-agent-string-switcher
         ];
         inherit search;
       };