feat(firefox): add plugins through nix

modules/programs/firefox.nix

@@ -1,6 +1,7 @@
 { config
 , lib
 , inputs
+, pkgs
 , ...
 }:
 
@@ -33,13 +34,27 @@ in
   config = mkIf cfg.enable {
     home-manager.users.moritz.programs.firefox = {
       enable = true;
-      profiles."default".extraConfig = mkIf cfg.arkenfox.enable ''
-        // Arkenfox user.js
-        ${arkenfox}
+      profiles."default" = {
+        extraConfig = mkIf cfg.arkenfox.enable ''
+          // Arkenfox user.js
+          ${arkenfox}
 
-        // Overrides
-        ${cfg.arkenfox.overrides}
-      '';
+          // Overrides
+          ${cfg.arkenfox.overrides}
+        '';
+        extensions = with pkgs.nur.repos.rycee.firefox-addons; [
+          darkreader
+          firefox-color
+          istilldontcareaboutcookies
+          kagi-search
+          keepassxc-browser
+          languagetool
+          multi-account-containers
+          ublock-origin
+          wikiwand-wikipedia-modernized
+          vimium
+        ];
+      };
     };
   };
 }