diff --git a/layout/style/ua.css b/layout/style/ua.css
index 5f28d0c677f..77e596ab116 100644
--- a/layout/style/ua.css
+++ b/layout/style/ua.css
@@ -190,7 +190,6 @@
 
   * {
     cursor: default !important;
-    -moz-user-select: none !important;
   }
 
   *|*::-moz-viewport, *|*::-moz-viewport-scroll, *|*::-moz-canvas,