diff --git a/scss/forms/_form-select.scss b/scss/forms/_form-select.scss
index a9cd8676de..720b7a1c61 100644
--- a/scss/forms/_form-select.scss
+++ b/scss/forms/_form-select.scss
@@ -57,6 +57,12 @@
   &::-ms-expand {
     display: none;
   }
+
+  // Remove outline from select box in FF
+  &:-moz-focusring {
+    color: transparent;
+    text-shadow: 0 0 0 $form-select-color;
+  }
 }
 
 .form-select-sm {