diff --git a/home-modules/firefox-webapp.nix b/home-modules/firefox-webapp.nix
index a34dc8c6..561a0c1c 100644
--- a/home-modules/firefox-webapp.nix
+++ b/home-modules/firefox-webapp.nix
@@ -66,6 +66,8 @@ let
             system = 2;
           };
         };
+
+        extensions = cfg.extensions;
       }
     ) cfg;
 in
@@ -104,6 +106,12 @@ in
             description = "Additional Firefox profile settings.";
           };
 
+          extensions = mkOption {
+            type = listOf package;
+            default = [ ];
+            description = "Additional Firefox profile extensions.";
+          };
+
           backgroundColor = mkOption {
             type = str;
             default = "rgba(0, 0, 0, 0)";