diff --git a/web/rootfs/defaults/nginx.conf b/web/rootfs/defaults/nginx.conf
index 8260c2e..8626887 100644
--- a/web/rootfs/defaults/nginx.conf
+++ b/web/rootfs/defaults/nginx.conf
@@ -32,6 +32,8 @@ http {
 	types {
 		# add support for wasm MIME type, that is required by specification and it is not part of default mime.types file
 		application/wasm wasm;
+		# add support for the wav MIME type that is requried to playback wav files in Firefox.
+		audio/wav        wav;
 	}
 	default_type application/octet-stream;