diff --git a/app/assets/stylesheets/zammad.scss b/app/assets/stylesheets/zammad.scss
index 920a171d8..c23616bfa 100644
--- a/app/assets/stylesheets/zammad.scss
+++ b/app/assets/stylesheets/zammad.scss
@@ -1574,25 +1574,6 @@ select.form-control:not([multiple]) {
   @extend .u-unclickable;
 }
 
-/* 
-
-  Firefox only hack
-  -----------------
-
-  Firefox below version 35 doesn't allow us to 
-  hide the dropdown arrow but we want to replace 
-  it with our own icon. So we have to hide our own 
-  icon in Firefox versions under 35.
-  
-  The class is set via Javascript
-
-*/
-
-html.ff-lt-35 .form-control + .icon-arrow-down,
-html.ff-lt-35 .dropdown-arrow {
-  display: none;
-}
-
 select::-ms-expand {
   display: none;
 }