diff --git a/chrome/multi-row_tabs.css b/chrome/multi-row_tabs.css
index 351170c..d04f137 100644
--- a/chrome/multi-row_tabs.css
+++ b/chrome/multi-row_tabs.css
@@ -51,7 +51,7 @@ See the above repository for updates as well as full license text. */
   margin-inline-start: 0px !important;
 }
 
-.tabbrowser-tab[fadein]:not([pinned]){
+#tabbrowser-tabs[orient="horizontal"] .tabbrowser-tab[fadein]:not([pinned]){
   min-width: var(--multirow-tab-min-width) !important;
   flex-grow: var(--multirow-tab-dynamic-width) !important;
 }