diff --git a/src/app.html b/src/app.html
index 6d8a95b..d18307f 100644
--- a/src/app.html
+++ b/src/app.html
@@ -18,6 +18,6 @@
   <!-- Prefetch data specified in "load" functions on link hover -->
   <body data-theme="formula11Theme" data-sveltekit-preload-data="hover">
     <!-- SvelteKit inserts the body contents here -->
-    <div style="display: contents; user-select: none">%sveltekit.body%</div>
+    <div style="display: contents; user-select: none; -moz-user-select: none">%sveltekit.body%</div>
   </body>
 </html>
