diff --git a/Userstyles/Hacker News Dark.user.css b/Userstyles/Hacker News Dark.user.css
index a03ba85..174f541 100644
--- a/Userstyles/Hacker News Dark.user.css	
+++ b/Userstyles/Hacker News Dark.user.css	
@@ -1,3 +1,4 @@
+@-moz-document domain("news.ycombinator.com") {
 /* sizing */
 html {
     font-size: 15px;
@@ -203,4 +204,4 @@ a.nosee .votearrow::after {
         font-size: 16px;
     }
 }
-  
+}
\ No newline at end of file