diff --git a/snippets/custom-text-selection.md b/snippets/custom-text-selection.md
index bfa1edc35..96a44ceff 100644
--- a/snippets/custom-text-selection.md
+++ b/snippets/custom-text-selection.md
@@ -24,7 +24,8 @@ Changes the styling of text selection.
 </div>
 
 <style>
-.snippet-demo__custom-text-selection::selection {
+.snippet-demo__custom-text-selection::selection,
+.snippet-demo__custom-text-selection::-moz-selection {
   background: red;
   color: white;
 }